Bodes Precast Concrete | Serving Whatcom, Skagit, San Juan and Island Counties

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The Importance of Filtration

The Importance of Filtration

Filtration is just as important to the integrity of the septic system as water-tight seals. There is a movement in place now to make effluent filters mandatory across states that have adopted ASTM C-1227 as a regulatory specification. Today, 13 states are mandatory and several are in the process of passing legislation. Why the move to filtration?

Septic tanks are designed to hold the solid waste in the tank while releasing “brown water” through the leaching fields for purification and eventual return to the water table. However, solids do not always collect at the bottom of the tank. Solid waste occasionally floats to the top of the tank and exits through the outlet pipe into the leaching field. Another unpleasant scenario. To prevent solids from leaving the tank, wastewater manufacturers have invented septic tank filters.

Polylok has four filter designs that range in size from 800 gallons per day (GPD) to over 10,000 GPD. The PL-68 offers 1/16” filtration slots that prevent solids greater than 1/16” from leaving the septic tank. This tank is ideal for residential use at 800 GPD. The PL-122 offers the same filtration, but has a 1,500 GPD capacity. In addition, it has a patented shut-off ball that prevents solids from leaving the tank during cleaning. The PL-525 is designed for heavier flows and handles over 10,000 GPD. It also has the same patented shut-off mechanism. The PL-625 is the largest commercial filter in its class. The PL-625 offers a finer level of filtration at 1/32” that is ideal for grease traps, oils and fats. All these filters are NSF approved and widely used across the United States and Canada.


Bode's Precast Concrete - Serving the Pacific NW