Pleatco PRB17.5SF-JH-M-PAIR Antimicrobial Cartridge/Grid Replacement for Dynamic Series Iv-Model Dsf 35, Waterway Pleatco Cartridge Filter replacement Cartridge/Grid Dynamic Series IV - Model DSF 35, Waterway (Antimicrobial) Mfg.No.:817-3510, 17-2606, 6000-134, R173432