Solids mixed with the effluent entering the septic field can cause catastrophic damage to the entire system. The Ef4 by Tuf Tite removes solids down to 1/16" and greatly extend the life of your septic system. Shown above is the Tuf-Tite EF-4 Combo which includes the 4" standard length (14" rise) T-Baffle, the EF-4 Filter, and the B4035 bushing for reducing the outlet from Sch. 40 to SDR35 pipe.