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Effluent Filter | Polylok PL-122 Effluent Filter - 1,500 GPD

The PL-122 was the original Polylok filter. It was the first filter on the market with an automatic shut-off ball installed with every filter. When the filter is removed for regular servicing, the ball will float up and prevent any solids from leaving the tank. Our patented design cannot be duplicated.

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PL-122 Installation:
Ideal for residential waste flows up to 1,500 gallons per day (GPD). Easily installs in any new or existing 4" outlet tee.

  1. Locate the outlet of the septic tank.
  2. Remove the tank cover and pump tank if necessary.
  3. Glue the filter housing to the outlet pipe, or use a Polylok Extend & Lok if not enough pipe exists. 
  4. Insert the PL-122 filter into tee.
  5. Replace and secure the septic tank cover.

PL-122 Maintenance:
The PL-122 Effluent Filter will operate efficiently for several years under normal conditions before requiring cleaning. It is recommended that the filter be cleaned every time the tank is pumped, or at least every three years.

  1. Do not use plumbing when filter is removed.
  2. Pull PL-122 cartridge out of the tee.
  3. Hose off filter over the septic tank. Make sure all solids fall back into septic tank.
  4. Insert filter back into tee/housing.


  • Offers 122 linear feet of 1/16” filter slots, which significantly extends time between cleaning.
  • Has a flow control ball that shuts off the flow of effluent when the filter is removed for cleaning.
  • Has its own gas deflector ball which deflects solids away.
  • Installs easily in new tanks, or retrofits in existing systems.
  • Comes complete with its own housing. No gluing of tees or pipe, no extra parts to buy.
  • Has a modular design, allowing for increased filtration.

Technical Specs