System Sand Requirements

System Sand is a crucial component of Enviro-Septic® Technology. PEI strongly recommends a sieve analysis is performed to ensure that the sand provided meets System Sand requirements of an ASTM C-33 Sand with less than 3% passing a #200 sieve (the value must be obtained by washing per C117 method).

Presby Environmental maintains a referral list of System Sand Suppliers for our clients. Suppliers on our Referral List are expected to perform periodic random sampling of their sand, confirming that it continues to meet System Sand specifications. The Bill of Lading provided to purchasers of the specified System Sand should state that the sand provided is Enviro-Septic® System Sand.

If you would like to be considered for our System Sand Supplier Referral List, please fill out and submit an application (a representative sieve analysis is required). For more information on System Sand and the requirements, please see the System Sand Tech Bulletin pdf.

For information on System Sand Suppliers in your state, please see the Interactive Map page.





ASTM C-33 Standard

Sieve (Specification E11) Percent Passing

  • 9.5-mm (3/8 in.) 100%
  • 4.75-mm (No. 4) 95 to 100%
  • 2.36-mm (No. 8) 80 to 100%
  • 1.18-mm (No. 16) 50 to 85%
  • 600-µm (No.30) 25 to 60%
  • 300-µm (No. 50) 5 to 30%
  • 150-µm (No. 100) 0 to 10%

And Presby Environmental, Inc. Requires:

  • 75-µm (No. 200) 0 to 3% (value must be obtained by washing)*

* This requirement is more strict than ASTM C-33, but is extremely important.