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Septic tank pumpout SNAFUS:
This article describes common mistakes and misunderstandings about cleaning or pumping the septic tank. We explain why pumping too infrequently (or never) is a bad idea but we add that pumping more often than necessary is more or less tossing money down the toilet.
We also explain why a septic tank is normally always "full" and that after pumping the septic fills up pretty quickly in normal use. The article also describes effective vs. ineffective septic tank pumping and how you can improve the septic tank cleaning procedure so that pumping the tank is actually useful.
Finally we note immediate & serious safety hazards that should be addressed when cleaning septic systems.
Failure to pump the septic tank frequently enough: leading to an early drainfield failure and to the need for costly repairs
Pumping or cleaning the septic tank too frequently, wasting money (though you're wasting a lot less money than the cost of a new drainfield.
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Some septic pumping contractors and some other "experts" give a fixed rule of thumb that gives advice that is safe and profitable such as "pump your septic tank every year" or "pump your septic tank every two years". This advice is safe but except for unusual circumstances it is wrong.
Contractors may give this advice without
first having actually considered any information about the actual septic system capacity, size, level of
usage, age, or other conditions. It's a great example of "OPM" or "other people's money" - spending someone else's money to reduce your risk that they'll complain that your advice wasn't safe enough.
In a failing septic system case in Minnesota, the contractor assured that "things will be fine if you just pump the septic tank every couple of months or after you've had a lot of visitors". The theory is that you pump the septic tank the septic tank after heavy usage to "get back to normal".
It might be smarter to pump the septic tank before or both before and after heavy use when we know a septic system is marginal. But this can be pretty expensive.
Using a hired port-a-john might be much less expensive and might help avoid a sewage backup.
Pumping the septic tank to "fix" a clogged or failing drainfield. All you really gain is a few days of toilet flushing before the tank has re-filled, or at most weeks of respite.
More frequent pumping of the septic tank amounts to treating the septic system (tank and disposal fields) as a septic holding tank system instead - a costly proposition that may be necessary in some emergencies but not an attractive solution to onsite wastewater disposal. More about this snafu is provided below.
Pumping the septic tank before a septic system inspection or test.the purpose of this tank pump-out is to hopefully prevent the inspector from finding evidence of a failed drainfield. An empty septic tank prevents the test-inspector from pushing any effluent into the drainfield.
Ten Septic Tank Fantasies - costly misconceptions worth reconsidering
If you're normal you don't have fantasies about septic tanks. OK let's call these "septic tank misconceptions" that are worth clearing-up both to save money and to care for the system effectively.
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Septic tank fantasy No. 1: we need to pump out the septic tank whenever the septic tank gets full
A septic tank in normal use is always full, right up to the bottom of the outlet pipe (near the top of the tank). After pumping it out completely, an empty septic tank fills up again under normal usage in just a few days, after which it is again discharging liquid effluent to the absorption field, soakaway bed or leach field - names vary by country.
In a normally-working conventional septic tank we find wastewater, or "blackwater": a combination of watery sewage effluent, a floating scum layer at the tank top (in Austraila the "scum blanket", and settled sludge in the bottom of the tank.
If as in the sketch above we could see a cross section of the septic tank contents (if we wanted to) we would know when pumping the septic tank is actually necessary based on its sludge and scum layers - that is, based on data instead of either theory or wild arm-waving.
A septic pump-out is needed when the thickness of the floating scum layer and settled sludge layer occupy so much of the tank volume that the free liquid area is "too small" - the "net free area" has become so small that
the EFFLUENT RETENTION TIME, the time that wastewater has in the tank to allow for solids and floating scum to separate from effluent being discharged to the drainfield (soakaway in the U.K.) is too short. This gives new meaning to time is short, right?
Short septic tank effluent retention time means we're pushing solids into the drainfield, clogging it up & shortening its remaining life.
Two valid septic tank cleaning approaches involve either using
the SEPTIC TANK PUMPING SCHEDULE or using objective data obtained by actually inspecting the septic system, diagnosing any problems or failures, and inspecting conditions inside the septic tank.
In part II of this discussion SEPTIC TANK OBJECTIVE DATA we explain how a septic contractor can measure the scum and sludge layers.
That's a step that's sometimes worth the trouble and that might be taken the next time you have the septic tank pumped. You can't see into the septic tank, but a contractor, by opening the tank
can MEASURE SCUM & SLUDGE.
Pump the septic tank when ANY of the following is TRUE
Total depth of scum plus sludge layers equals 1/3 of the depth of the tank
Bottom of the septic tank outlet baffle has less than 3 inches of clearance from the bottom of the floating scum layer
Bottom of the outlet baffle is less than 6 inches from the top of the sludge layer on the septic tank bottom
Finally, sometimes extra septic tank pump-outs are useful - something that we will discuss below.
Septic tank fantasy No 2: additives and chemicals will fix or extend the life of the septic system
In a conventional and most other septic system designs not only do additives, chemicals and treatments do little or no good, some can damage the system, causing frothing, causing solids to be discharged to the drainfield.
No expert recommends the use of septic treatments or additives, and these substances are illegal to use in many jurisdictions in the U.S. and Canada, at least in part because some of them are also toxic and are environmental contaminants.
Septic tank fantasy No 3: some septic systems never need to be cleaned, pumped, serviced.
Nope. As my Mom used to day, in your dreams, buster.
The septic tank shown at left was totally packed with solids and was collapsing - it had not been pumped in decades. The home, occupied by a single elderly person, limped along until new owners bought the property and tried taking a couple of showers.
The morning after the new family moved in sewage was coming up in the yard. This case is discussed
at SEPTIC FAILURE LAWSUIT.
It is true that the required septic cleanout frequency varies not only by tank size, wastewater volume being produced, and system design, and some systems require less frequent cleaning for the same usage level compared to other designs, but all septic systems need periodic maintenance.
Failure to properly maintain the septic system is the No. 1 cause of early septic system failures.
Septic tank fantasy No. 4: pumping out the septic tank can restore or save a failed or failing drainfield
Unfortunately, a drainfield or soakaway bed that is in failure would require an estimated 5-10 years of total rest to "recover" enough to be restored to normal use.
Even then the field won't work if it's flooded or if the field has been damaged by vehicle traffic, tree roots or similar troubles.
What you actually get by extra septic tank pump outs in an area of failed drainfield is a few days (less than a month) of toilet flushing and wastewater disposal into the septic tank until it fills up again and is again trying desperately to push septic wastewater effluent out into the soakaway bed.
How quickly does the septic tank fill up again? Experts estimate as much as 200 gallons of wastewater is generated per occupant per day
Even using a fantastically small number of 50 gallons per person per day in a home where extreme water conservation measures are in effect or where there is a single elderly occupant using very little water, the septic tank still fills up quickly - typically in as few as 1-2 days, or at most in about 20 days of use.
Resting a failing or failed drainfield for 20 days doesn't fix anything.
Septic tank fantasy No. 5: all we need to do is pump the liquid out of the septic tank
Wow what a mistake this is.
At left I show sewage effluent running down a hill over rock.
That straw-covered pile in the top of the photo was covering the septic tank that the property seller had asked her septic contractor to pump out just a few days before my inspection.
That the system was in total failure was evident after just two days of household use of the septic system.
The tank had re-filled in that time, then sent effluent to the property surface.
To be of any use at all, when pumping the septic tank we need to remove the settled sludge and floating scum from the septic tank, not just the liquid effluent.
If the septic contractor just pokes that septic tank pumping hose down into the middle of the tank and just pumps like mad all she's doing is removing the effluent.
The sludge stays on the tank bottom - or most of it does - and the floating scum falls down to rest nicely atop the sludge layer.
What is our septic tank pumping contractor doing with that pole in his right hand while he manuipulates the pumper truck hose with his left?
He's using long-handle hoe-like tool to scrape and stir up the dense sludge on the septic tank bottom, mixing in a bit of liqui so that the vacuum hose can pull the sludge out of the septic tank.
Your guy doesn't do this? Interesting.
Watch out: If your septic tank pumping company tells you it's a good idea to leave solids in the septic tank - we know of a company that actually returns solids to the septic tank after separating out the effluent in their special pumper truck
- Just Say NO! Tell 'em not to let the door hit their backside while they're on the way out.
You need to find a different septic pumping service.
The We Pump it & then We Put it Back septic pumping company is simply saving themselves the cost of disposing of sewage from their truck, they're not doing anything to help your septic tank nor system and they're speeding the demise of the absorption field.
The object of tank pumping is to remove the solids (sludge and scum) from the septic tank and thus to increase EFFLUENT RETENTION TIME.
An effective septic tank cleanout removes the scum and sludge by moving the pumping hose around and by using the liquid effluent to help break up and pump out the solids. If the pumper just tackles the easy task of pumping out the liquid effluent itself he's not performing a useful job.
Just pumping out liquid effluent doesn't benefit the system. In fact, just pumping out effluent and leaving the solids means that after every such unfortunate "mis-service" of the tank the actual remaining tank volume available for wastewater treatment is less and less.
Septic tank fantasy No. 6: it's possible to pump the septic tank through a small-diameter pipe or riser
Not easily, but it might be possible. In traditional septic tank cleaning operations the operator needs room to manipulate the septic pumper truck hose to remove the floating scum layer and settled sludge layer.
Without manipulation space and room to stir sludge and scum with a hoe, rake or other tool, removal of solids is difficult and might be limited.
At left we show small-diameter septic tank riser that has been used for years to "pump out" the septic tank at this Minnesota home.
But how thoroughly do you think the septic tank pumper can clean the septic tank working through just this small-diameter opening to reach a tank located several feet below?
Using a Manual Tool to Break Up Septic Tank Sludge & Scum for Pumping
Unless we do something extra (see below) it is just about impossible to remove most of these key constituents if all we can do is poke a pumper hose straight down into the septic tank.
Jimmy Herring (Herring Sanitation, Poughkeepsie, NY) demonstrated the right way to clean out a septic tank in the photos below. You'll see that Mr. Herring is working through a much larger opening - the septic tank access cover gives enough room to manipulate the pumping hose.
Crust-Busters to the Rescue!
Crust Busters provides a motor-driven auger that stirs up the septic tank floating scum and settled scum layers, permitting the septic tank pumper to successfully remove these constituents along with septic effluent.
The Crust Buster is a 33-pound motor driven mixing device that combines an 80-inch shaft with folding, hinged mixing bladesthat open out when spinning to break up and make septic tank solids pump-able through a small access port.
Depending on the diameter of the septic tank pumping opening the operator selects a 2-blade attachment that can slip thorugh a 4-inch diameter opening, or a 3-blade attachment that is not collapsible and fits through a 12" or larger diameter opening. Crust Buster shaft extensions permit operating the device in deeper septic tanks. - Thanks to septic cleaning contractor Daniel Zeimet, Two Harbors MN, for this tip.
13667 Meridian Avenue North
Monticello, MN, 55367
E-mail: email@example.com, website: http://www.crustbusters.com
Daniel J. Zeimet, DBA Lind's Septic Servivce,
1932 Big rock Road, Two Harbors, MN 55616, Tel: 218-834-6969
Still Septic Tank Inspection Limitations May Remain
Still, working through a tall, narrow 6" diameter vertical riser, it is difficult if not impossible to inspect the septic tank condition and that of its baffles through such a narrow vertical access opening, even using a traditional flashligt and mirror.
See(INSPECT the SEPTIC TANK DURING PUMPING
If we can't gain visual access to the septic tank interior or visual access by removing covers at the inlet and outlet ports, we won't know the condition of the tank, it baffles, its sludge and scum layers. We also may not know if there are leaks into the septic tank or leaks out of it through damage or poor seals at any of its openings.
Without using a larger septic tank access opening we probably won't know if a flooded drainfield is back-flowing into the tank during pumping, and we won't know how much sludge and scum were left in the tank. The photos above show important conditions that you cannot see through an 8" diameter septic tank riser.
Technical note: it's possible to to add a large-diameter septic tank riser capped by a vehicle and child-safe cover to make future septic tank servicing more effective. But don't spend on this improvement before knowing that the septic tank itself will continue in use. For example, a rusted-out steel septic tank is going to need complete replacement.
It may also be possible to gain improved visual access to an otherwise difficult-to-access septic tank interior using electronic gear including flexible borescopes, lights, and similar remote inspection camera-equipment: all added sophistication, complexity, and costs that may mean these tools are not in the hands of most septic tank pumping companies.
Septic tank fantasy No. 7: it's ok to discharge excess septic effluent from the septic tank to the surface, to a nearby drainage ditch, lake, stream, or to your neighbor's yard.
Are you kidding me?
In a conventional septic system (tank and soil absorption bed or drainfield) no more than 40% of the wastewater treatment is handled by bacteria in the septic tank. The rest of the wastewater treatment occurs thanks to bacteria in the soil.
Discharging such wastewater anywhere out of the treatment system is unsanitary, contaminates the environment, makes your neighbor mad, and is illegal virtually everywhere. You are not even allowed to discharge graywater (washers and sinks) to the surface.
An exception is clarified highly-treated wastewater effluent produced by a properly working aerobic septic system and highly-treated wastewater from advanced septic system designs that treat effluent to a level equal to or exceeding the sanitary nature of ordinary ground water or surface water.
In these instances discharge of wastewater may be allowed by permit though for some installations a final wastewater disinfection step may still be required. In some jurisdictions such as areas of the U.K., sewage treatment plants are required and traditional septic tanks and soakaways are no longer permitted. - Crystal Tanks, U.K. (2014)
Septic tank fantasy No. 8: if the toilets flush and drains drain the septic tank is working
Our photo at left shows heavy algae growth along the shore of a waterway abutting an older home whose septic system was installed in the 1970's.
No sewage effluent appears at the surface of the property, toilets flush (though slowly and badly) and drains drain (though sometimes slowly). There are no sewage odors at the property. Even a septic loading and dye test may fail to show a system failure at this home.
Because the algae grows only close to this property we suspect that high nitrate discharge from a failed septic system is producing heavy algal growth in this spot.
The combination of age, algae, and slow burbling drains is an indicator of the condition of the system though there is no evidence of sewage effluent at the ground surface.
This septic system is in technical failure in that it is not properly treating the wastewater it receives.
Watch out: A system in this condition is also at high risk of sewage backup into the building.
Pumping the septic tank won't alleviate this trouble: days after the tank is pumped effluent will again be discharged into soils that ultimately drain into this waterway. Improvement in the treatment level within the septic tank might help (a conversion to aerobic?) or drainfield reconstruction may be needed.
Pumping the septic tank may give temporary toilet flush improvements but it's not going to repair a clogged drain nor a failing drainfield.
Technical note: if an older grandfathered septic drainfield is closer to a body of water than current codes allow, its replacement may need to be relocated to a more distant location. In that event we usually can leave the septic tank in place, adding an effluent pump to move the tank output to the new absorption bed.
Septic tank fantasy No. 9: ok so we know the septic system is old and at end of life. It's ok to keep using it, right?
Well this fantasy has merit: sort-of.
We never want to call a contractor in a panic asking for an emergency repair: the price of the job doubles or worse, not only out of gouging or greed but because the contractor has to shuffle work, put off other customers, and maybe ultimately even lose that deferred business.
But considering the cost of having to clean up a major sewage spill in a building it makes sense to fix septic problems before the last possible occasion: when the system has suffered a catastrophic failure. Meanwhile here are some limp-along steps that can help defer the inevitable:
Conserve water: minimize the running of sinks, showers, tubs. Flush the toilets only when really necessary, not after every pee.
Make certain that no plumbing fixtures or equipment are running constantly: running toilets, water softeners stuck in regeneration mode, etc.
Don't flush unnecessary food waste, oils, or toilet tissue into the system. Minimizing the solids load on the septic tank makes wastewater treatment a bit easier.
Provide septic tank pumping access: If the septic tank pumping access is not readily available, or if the septic riser is too small to prevent actual removal of the solid sludge & scum, when weather & money permit, install a larger septic tank riser so that the tank can actually be properly cleaned.
Otherwise pumping what will be mostly just the liquid effluent won't help much.
Pump the septic tank, emphasizing the removal the sludge and scum debris, before anticipated heavy usage.
It may make some sense to pump the tank after heavy usage too, but pumping it before reduces the chance of a sewage backup into the building during the big event when lots of people are present - the ugliest time for dealing with a backup.
Watch out for slow drains during an interval of heavy usage and if it's occurring, ask occupants to space out toilet usage, pee outdoors, or use the port-a-john (our preferred measure)
Hire a port-a-john before that big family wedding or festival when you're inviting 20 extra people to stay over for a weekend or longer. Actually, experts consider an extra 3 people visiting over a weekend as stressful on a marginal septic system.
Check with your homeowners insurance company and if available, add policy coverage that will address a sewage backup into the home.
Don't leave precious art-works or valuable carpeting on the home's lowest floors.
Redirect surface runoff: when weather, time & money permit, AND if wholesale septic tank or drainfield replacement are NOT going to be done quite soon, spend on directing surface runoff away from the drainfield area. If there is deep groundwater flooding the drainfield you may need to add a curtain drain.
Otherwise simple surface contouring may be enough. DO NOT drive equipment over the drainfield.
Redirect graywater to reduce the load on an older septic system: adding a separate drywell makes sense for some properties where space and money allow. By reducing the graywater load on the septic drainfield we extend its life and eke out more years before it has to be replaced.
Add a septic or graywater filter: Some designers recommend adding a filter system to an existing building's plumbing system to keep lint out of the septic tank, or if using a drywell, to keep lint out of the drywell - a good idea but I'm doubtful that a septic filter alone is going to rescue a failing septic absorption field.
The septic or gaywater filter may added ahead of the septic tank or drywell or in a different design a septic effluent filter is added at the septic tank outlet to protect the drainfield. Such filters require periodic maintenance (cleaning) to avoid a sewage backjup.
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Pennsylvania State Fact Sheets relating to domestic wastewater treatment systems include
Pennsylvania State Wastewater Treatment Fact Sheet SW-161, Septic System Failure: Diagnosis and Treatment
Pennsylvania State Wastewater Treatment Fact Sheet SW-162, The Soil Media and the Percolation Test
Pennsylvania State Wastewater Treatment Fact Sheet SW-l64, Mound Systems for Wastewater Treatment
Pennsylvania State Wastewater Treatment Fact Sheet SW-165, Septic Tank-Soil Absorption Systems
Document Sources used for this web page include but are not limited to: Agricultural Fact Sheet #SW-161 "Septic Tank Pumping," by Paul D. Robillard and
Kelli S. Martin. Penn State College of Agriculture - Cooperative Extension, edited and annotated by
Dan Friedman (Thanks: to Bob Mackey for proofreading the original source material.)
Advanced Onsite Wastewater Systems Technologies, Anish R. Jantrania, Mark A. Gross. Anish Jantrania, Ph.D., P.E., M.B.A., is a Consulting Engineer, in Mechanicsville VA, 804-550-0389 (2006). Outstanding technical reference especially on alternative septic system design alternatives. Written for designers and engineers, this book is not at all easy going for homeowners but is a text I recommend for professionals--DF.
Builder's Guide to Wells and Septic Systems, Woodson, R. Dodge: $ 24.95; MCGRAW HILL B; TP;
Quoting from Amazon's description: For the homebuilder, one mistake in estimating or installing wells and septic systems can cost thousands of dollars. This comprehensive guide filled with case studies can prevent that. Master plumber R. Dodge Woodson packs this reader-friendly guide with guidance and information, including details on new techniques and materials that can economize and expedite jobs and advice on how to avoid mistakes in both estimating and construction. Chapters cover virtually every aspect of wells and septic systems, including on-site evaluations; site limitations; bidding; soil studies, septic designs, and code-related issues; drilled and dug wells, gravel and pipe, chamber-type, and gravity septic systems; pump stations; common problems with well installation; and remedies for poor septic situations. Woodson also discusses ways to increase profits by avoiding cost overruns.
Country Plumbing: Living with a Septic System, Hartigan, Gerry: $ 9.95; ALAN C HOOD & TP;
Quoting an Amazon reviewer's comment, with which we agree--DF:This book is informative as far as it goes and might be most useful for someone with an older system. But it was written in the early 1980s. A lot has changed since then. In particular, the book doesn't cover any of the newer systems that are used more and more nowadays in some parts of the country -- sand mounds, aeration systems, lagoons, etc.
"Environmental Health Practitioner Manual: A resource manual for Environmental Health Practitioners working with Aboriginal and Torres Strait Islander Communities", Australia Department of Health, Department of Health
GPO Box 9848,
Canberra ACT 2601, Australia, retreived 3/31/14, Original source: https://www.health.gov.au/internet/publications/publishing.nsf/Content/ ohp-enhealth-manual-atsi-cnt-l~ohp-enhealth-manual-atsi-cnt-l-ch2~ohp-enhealth-manual-atsi-cnt-l-ch2.9
P. O. Box 439
4365 Steiner Street
St. Bonifacius, MN
Tel 800-328-3420 (Customer Service)
Fax 800-874-2371 (Customer Service)
"Septic Tanks", Greer Tank & Welding, Inc., 3117 107th Street Greer Steel in Lakewood Washington
Woodworth Industrial Park
Lakewood, Washington 98499 Tel: 800-725-8108, email: firstname.lastname@example.org, retrieved 3/31/14, original source: http://www.greertank.com/septictanks.html
"Septic Tanks, Septic Tank Systems - the superior traditional two chamber design", Crystal Sewage Treatment
Bolton House Farm
Telephone: 01759 369915
Website: http://www.crystaltanks.com, Tel: 01759-369915, retrieved 3/31/14, original source: http://www.crystaltanks.com/septic_tank_crystal.html
In the U.K. also see "Code of Practice - Flows & Loads 4 - Sizing Criteria, Treatment Capacity for Small Wastewater Treatment Systems" & "Code of Practice - Guide to the Installation of Small Wastewater Treatment Systems" and "Code of Practice – Guide to the Desludging of Small Wastewater Treatment Systems" provided by britishwater.co.uk at http://www.britishwater.co.uk/publications/Publications_and_Technical_Guides.aspx
Snyder Industries, Inc.
4700 Fremont Street (P.O. Box 4583)
Lincoln, Nebraska 68504
Phone: 402-467-5221, Tel (Sales): 402-465-1237, Email: email@example.com
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: firstname.lastname@example.org. The firm provides professional home inspection services & home inspection education & publications. Alan Carson is a past president of ASHI, the American Society of Home Inspectors. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors. Special Offer: For a 5% discount on any number of copies of the Illustrated Home purchased as a single order Enter INSPECTAILL in the order payment page "Promo/Redemption" space.
TECHNICAL REFERENCE GUIDE to manufacturer's model and serial number information for heating and cooling equipment, useful for determining the age of heating boilers, furnaces, water heaters is provided by Carson Dunlop, Associates, Toronto - Carson Dunlop Weldon & Associates Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on any number of copies of the Technical Reference Guide purchased as a single order. Just enter INSPECTATRG in the order payment page "Promo/Redemption" space.
The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume.
Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on these courses: Enter INSPECTAHITP in the order payment page "Promo/Redemption" space. InspectAPedia.com editor Daniel Friedman is a contributing author.
The Horizon Software System manages business operations,scheduling, & inspection report writing using Carson Dunlop's knowledge base & color images. The Horizon system runs on always-available cloud-based software for office computers, laptops, tablets, iPad, Android, & other smartphones