GeoMat Leaching System

The Numbers

  • GeoMat receives 2.0 gpd/sq.ft. load rate because it is proven to provide maximum treatment of wastewater.

  • 2.0 load rate reduces mound size, lowers profile, saves sand & stone, and cuts average installation time in half.

  • Inground systems require only 37” insitu soil, virtually eliminate at-grades, and provide options for any site.  

The Facts

  • Shallow burial depth + even dispersal of water = maximum oxygen transfer

  • Anaerobic bacteria turns to aerobic bacteria when oxygen is present.

  • GeoMat plus 12" of C33 sand provides maximum treatment of wastewater.

The Mechanics

  • GeoMat increases the surface area because the shape and the entangled plastic                                      membrane draw water away from the point of application. across the 39” wide mat. 

  • At the same time, the one-inch thick profile maximizes contact with the sand below it. 

  • The wide surface area and thin profile is the perfect formula to have water travel quickly                            down through the sand, resulting in different levels of the sand being saturated only briefly, if at all.


The Technology

  • GeoMat is comprised of fused, entangled plastic wrapped in fabric on top and bottom.

  • The shape and the membrane together draw water away from the point of application, across the entire mat.

  • The thin 1" profile maximizes contact with the soil - which enhances oxygen transfer.

  • Result: GeoMat utilizes virtually the entire leachfield every time it doses.

The Proof

  • GeoMat 2.0 load rate and hydraulic capacity were proven in stringent NSF testing.                         

  • When a proprietary system is tested by ANSI/NSF, or other similar testing authorities,                                    the leaching system is hydraulically loaded at the design loading rate every day.          ​

  • The design loading rate used to load the leaching system includes a peak flow,                                                which includes a safety factor typically between 1.5 to 2 times. 

  • In addition, the ANSI/NSF regime requires a high flow stress test be performed.

  • The loading rate applied under NSF testing protocol should never happen in the real world.



  • GeoMat is 39" wide x 1" thick

  • It comes in a 100' roll

  • One roll is 36"x36"x43" high

  • Weighs 70 lbs.

  • Easily fits in a pickup


  • Three bedrooms require 70 lineal feet

  • Four bedrooms requires 92 lineal feet

  • GeoMat design (CRU) files provide multiple options for any application

  • No wasted material. GeoMat sections can be butted together by placing a piece                                                 of typar across the joining sections and tucking it underneath the GeoMat on each side.

Dosing Systems

  • The quality of a pressurized system at substantially less cost 

  • GeoMat only requires 37" insitu soil for inground installations

  • Dosing systems use 2" Schedule 40 pipe with 1/2" orifices drilled at 4 and 8 o:clock

  • Orifices are spaced at 12" intervals; they do not require orifice shields

  • Unlike pressurized systems, dosing systems are approved by counties, saving time and money.

GeoMat Wisconsin Approval                  

  • Conventional gravity systems                                                                        

  • Conventional dosing systems                                                                           

  • Conventional pressurized systems

  • Regular mound systems

  • Split-bed mound systems

Wisconsin Component Manuals

Storing Water

  • Storing water reduces the size of the field by repeatedly dosing the same small area. 

  • By reducing the storage area, GeoMat comes in contact with more surface area.

  • Repeatedly dosing the same area results in the soil becoming saturated when                                          large quantities of water are used (laundry, baths, etc.) over a short time period.

  • When storage area is reduced, water travels quickly down through the sand beneath                           

       the mat resulting in different levels of the sand being saturated only briefly, if at all.

  • Saturated soil stops the flow of air into the ground, creating anaerobic bacteria (biomat).

  • When effluent infiltrates sand & soil, it pulls air down behind it, allowing liquids                                            or gas to pass through it, creating a dry aerobic environment.

  • As long as the soil remains wet, bacteria multiply, covering a larger area with biomat. 

  • A well-aerated environment increases treatment efficiencies. 

  • This domino effect shrinks the leachfield until it is completely covered with biomat.

  • Anaerobic bacteria cannot exist in a dry, well-aerated environment.


 Side by side comparison of a 4-bedroom mound   


4-bedroom dosing system installed by Brandenberg Plumbing in Marathon County

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GeoMat Load Rates


Table 383.44-2

GeoMat receives Right Column  BOD<30   TSS<30 


What's your time worth?

Do you want more time to do more work or do want more time to do less work?

You can start planning what to do with the extra time you'll have by installing GeoMat.  

Below: In-ground pressure system installed by Brian Gundy Septic Systems in Oneida County.

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