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Recirculating Sand Filter

Description of Technology

Descriptions for proprietary technologies are from the Massachusetts DEP Approval Letters for the technology.

The System has a recirculation tank and pump, and an underdrained open sand filter. Effluent from the septic tank is collected in the recirculating tank, where it is mixed with the effluent returned from the sand filter. The mixture is periodically pumped onto the sand filter and evenly distributed over the filter surface. A drain line, at the bottom of the sand collects the sand filter effluent and returns it by gravity to the recirculating tank (or if the tank is full, to the pump chamber). A Massachusetts registered professional engineer or registered sanitarian may design a System in accordance with 310 CMR 15.220(1)

Massachusetts Technology Approvals

Approval Type General Remedial Provisional Pilot
Secondary Treatment
Nitrogen Removal Credit
Phosphorus Removal Credit

Please check the Title 5 Innovative/Alternative Technology Approval Letters webpage at Massachusetts DEP for the most up-to-date information.

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