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Infiltrator chamber septic system leach field installation instructions and pricing.
Click here for main septic chapter with details and cost of other system parts.

Please note that we are not Infiltrator®, the manufacturer, and we do not normally ship Infiltrator chamber leach field systems outside the greater Denver area. Infiltrator chambers are delivered for no extra charge within about 50 mile radius of Denver (North to Loveland, South to Castle Rock, up to Georgetown, and out East to Byers). Standard Quick4 Infiltrator chambers are 34 inch wide (3 foot trench) by one foot tall by four foot long (net length after connecting together) and cost $33 each, $32 each for 50 or more, and $30 each for a full pallet load of 85 chambers. Rows of Infiltrator are generally limited to 12 or 13 chambers (about 50 foot length) requiring two $20 end caps for each row. Motor freight for a pallet of chambers can be well over $300, so we do not normally ship outside of our greater Denver free delivery area. For local distributor referral, please contact the manufacturer direct at: InfiltratorSystems.com e-mail: info@infiltratorsystems.com or phone: 800-221-4436.

"Are we allowed to install this septic system on our property" is not a question we can answer for you. We have been providing much the same passive (non electric) septic system parts for over twenty years now, but we do not follow constantly changing city, county, and state building regulations. Unfortunately, with 63 counties in Colorado, regulations changing from year-to-year, and interpretations of those rules varying from one inspector to another, it's never possible to say for certain 'what is allowed' locally. The county building department is your primary source of information on what is possible to install according to local 'code'. Rather than telephone them with questions, you should drive over in person and get a copy of their local Individual Sewage Disposal System ISDS Regs and also get a list of locally licensed soil engineers. The building department will confirm or revise your site plans once submitted for approval. Often the county inspector will assist you with site plans and design as a service provided for their permit filing fee. If not, they will refer you to a local engineering firm that can visit the property in person and design the system. We provide free consultation after the sale on installation procedures, system design improvements, and operational issues, but we do not provide any soil testing, on-site services, 'stamped' engineered plans, or 'advanced treatment' systems.

Infiltrator septic chamber leach field installation versus pipe in gravel stone and pipe

Conventional leach fields use perforated plastic pipes laid in a twelve inch gravel bed. It is not a stretch of the imagination to envision those small holes clogging faster than a three foot wide chamber. That's why we only sell the best! Infiltrator chamber leach fields are high-density polyethylene arches that interlock to form a continuous drainage area with a much greater storage ("surge") volume than conventional perforated pipe leach fields. Installation simply involves digging a series of three foot wide trenches (or a large rectangular bed as shown below), connecting the Infiltrator chambers and then backfilling with the soil you originally removed. No gravel is needed, but adding gravel above and below your chambers is always an upgrade to aid percolation in poor soils. Theoretically, over ninety percent of the solid waste entering your septic tank is broken down by anaerobic bacteria. The remaining sludge builds up until you pay to have it pumped out. If your septic tank is not pumped regularly, solid waste eventually overflows into the leach field where the soil clogs, your field 'fails' and has to be replaced, which is a very messy and costly affair. By the way, don't believe those ads you see for 'digesters' which are supposed to save your leach field by cleaning up your septic tank. A healthy, well-designed septic system works just fine without any assistance from over-hyped chemicals. An unhealthy, ill-designed septic system is going to fail regardless of how much digester you flush down the toilet. They are generally a waste of money and often do more harm than good. Plus, you run the risk of poisoning your groundwater in the process - anything that dissolves organic matter simply cannot be good for your well water quality.

The Infiltrator chamber septic system leach field differs from conventional leach fields, which use perforated plastic pipes laid in a twelve inch gravel bed. It is not a stretch of the imagination to envision those small holes clogging faster than a three foot wide chamber. That's why TheNaturalHome.com only sells the best! Infiltrator chamber leach field units are high-density polyethylene arches that interlock to form a continuous drainage area with a much greater storage ("surge") volume than conventional pipe leach fields. Structurally, chambers will take a heavy load, so you may drive over when necessary, just be sure to drive perpendicular to the chamber (like crossing rail road tracks) and never driving down the length of chambers. Installation simply involves digging a series of three foot wide trenches (or a large rectangular bed as shown below), connecting the Infiltrator chambers, and backfilling with the soil you originally removed. As a general rule, trenches (fingers) should be no longer than fifty feet (12 or 13 Infiltrators long) for best function. Unless you are installing as a "bed" system (where the chambers are right next to each other), leave at least six feet of undisturbed soil between fingers. In practice, this six feet of undisturbed soil between trenches becomes eight feet or more since you don't want to compact the soil above the Infiltrators; one should allow at least the width of the backhoe between trenches. And don't forget to loosen the soil twelve inches below bottom of the trench (scarify) before installing the Infiltrators leach chambers. The worst mistake you can make is to compact (smear) the soil in bottom of a leach field trench. You want to be sure to loosen the soil to allow for proper percolation of effluent. No gravel is needed - but gravel is always an upgrade option to aid percolation in any soil. No geotextile fabric (weed barrier material) is need - but in sandy and silty soils, it is recommended to cover the tops of your chambers with gravel and then fabric to keep soil from migrating into the chambers and surrounding gravel. For even more protection, fabric can be placed atop the chambers and then covered with 3/4 inch nominal crushed stone and then yet another layer of fabric atop the stone. Over-engineering is excellent insurance for long-term viability. As with most construction projects of this scope, it is always best to do the job right the first time.

Infiltrator chambers can be installed in a curved trench Quick4 chamber leach field products by Infiltrator systems

Infiltrator® chamber leach field systems are far superior to pipe-in-gravel in every aspect: smaller leach field size due to optimal percolation, increased retention capability for heavy loading days, root infiltration protection for long term viability, resistance to traffic, and more. You don't need to hire an engineer to design your septic system in most counties (we do not supply engineering services). Local regulatory officials normally allow you to submit a site plan and pull your installation permits as the homeowner-builder as long as the soil percolates well. Then you can save even more money by renting a backhoe and installing your own septic system! Installation is relatively straight-forward, but even seasoned professionals can get too mired in 'how they've always done it' to realize there are better ways to approach any project. We're here to help every step of the way, doing our best to ensure you don't make that one critical mistake, like not venting your leach field properly or not scarifying the base of your trenches. We encourage clients to mail copies of their septic system permit plans for our review after purchasing a system, as there are always details that could use improvement with any plan.

Standard Quick4 Infiltrator chambers are 34 inch wide (3 foot trench) by one foot tall by four foot long (net length after connecting together) and cost $33 each, $32 each for 50 or more, and $30 each for a full pallet load of 85 chambers. We offer a 3% discount when paid with cashier's check or postal money order (instead of MasterCard or VISA) and free delivery within about 50 miles of Denver or will-call pickup in person at Commerce City warehouse. Rows of Infiltrator are generally limited to 12 or 13 chambers (about 50 foot length) requiring two $20 end caps for each row. In average soils, budget around $2000 for two bedroom home leach field, $2500 for a three bedroom, and around $3900 for a complete 4 bedroom Infiltrator chamber leach field system by the time you factor in distribution box, pipe, and vent fittings. Total package price depends upon leach field layout (bed versus trench) and number of Infiltrator chambers required, which is not known until you get a soil test and a copy of the local Individual Sewage Disposal System ISDS regulations. Local building code supplies the equation used to calculate leach field size in the ISDS: number of bedrooms multiplied by the factor of percolation rate of the soil with a percentage reduction in size given for using Infiltrator chambers. We can quote the system after you supply us with a cut-list detailing number of chambers and end panels and whatever other fittings you may require, but we do not supply engineering services to determine how many chambers you will need.

Infiltrator Quck4 chamber cut sheet

All of the various 'gravel-less' leach field chamber system brands function by the same set of physical limitations, regardless of marketing claims. 'Necessary' installation tips are not to be implied, but there are always 'good, better, best' methods of approaching any construction project. 'Good enough' with chambers is digging a level trench. 'Better' is to scarify (loosen and rake) the soil in base of trench to a depth of one foot. 'Best practice' is adding a 6 to 8 inch layer of crushed gravel to ensure long-term percolation and best sewage treatment. Some engineers go one step further and lay perforated distribution pipe (pressurized or gravity drain) in chambers to ensure equal effluent introduction throughout the trench. Gravel in base of trench is common practice when specifying distribution pipe. A bit of gravel atop chambers with a layer of geotextile fabric is common practice in sandy or silty soils. Best practice is to limit trench lengths to about 50 foot (12 to 13 four foot long chambers) even when distribution pipes are installed.

Do-it-yourself infiltrator chamber leach field sewage disposal system basic conventional bed style layout

click here to view Infiltrator chamber system Quick4 cut sheet
On YouTube is Infiltrator's 12 minute Quick4 installation video
Infiltrator septic tank installations are detailed on this page
and complete products & pricing at main septic system chapter

Infiltrator chamber system installation instructions
View Infiltrator chamber leach field system installation manual

geotextile fabric - professional duty 35 mil 5 ounce sq/yd woven for use with Infiltrator chambers

While not 'required', it is conventional to place a layer of gravel atop the chambers and cover with geotextile fabric before backfilling atop in sandy and silty soils. This additional step is recommended when soils are loose or sandy and would otherwise tend to wash down into the chambers. The primary place for geotextile fabric is above the gravel layer of your leach field lines, French drain, or drywell leach pit. Additionally, one can line the outside walls/sides of the excavated leach pit or drain lines to keep soil from migrating into the gravel from sides. This sidewall protection is always recommended when soils are loose or sandy and would otherwise tend to wash soil into the gravel. Geotextile fabric is also used for wrapping perforated pipe-in-gravel French drains, as pictured at right, with fabric on the bottom of trench too. French drains are wrapped like a burrito, unlike septic leach field chambers where the fabric is on the top and sides only. Protecting your leach pit and perforated pipe gravel from soil and root infiltration is crucial to long-term soil percolation and preventing leach field failure.

Geotextile engineering specifications

Geotextile filter fabric used for wrapping French drain perforated pipe

3 foot, 4 foot, 5 foot, and 6 foot wide professional-duty geotextile fabrics
pre-cut rolls of 30 foot, 60 foot, 120 foot, and full 250 foot long rolls

Professional strength, heavy-duty woven 35 mil thick geotextile fabric is hydrophilic treated to
allow air, water, and nutrients through its needle punched, multi-layer technology for a lifetime of service.

* Price includes UPS Ground Shipping
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10% discount on 2 or more full 250 foot long rolls of professional-duty geotextile fabric

250 foot long rolls of geofabric at a discount
Price includes free UPS Ground Shipping to 48 states.
No delivery to APO/FPO, mail boxes, Hawaii, Alaska, Puerto Rico, US VI, Mexico or Canada
Full roll material normally ships by the next business day.

10% off 2 rolls or more

$170 - 3 foot by 250' roll
$220 - 4 foot by 250' roll
$270 - 5 foot by 250' roll
$320 - 6 foot by 250' roll

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Coming soon... option to order custom length, cut-to-size material sold by the foot

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