SimTech 4" Septic Tank Bristle Filter - SimTech STF-110 - (Filter Only) The Sim/Tech bristle filters offer superior filtration for tissue, hair, lint, and most common solids found in wastewater The STF-110 bristle filter easily installs in any exsting 4'' pipe or baffle and its flexible design allows for easy maintenance! Rated To Filter 1200 Gallons Per Day Over 2200 Square Inches of 1/16'' Filter Area Designed With Non-Directional Bristles For Unrestricted Flow