Efficient Filtration：Our replacement filter cartridges for Aqua-Pure water filter AP-DW80/90 can reduce chlorine, taste and odor, which is tested by IAPMO against NSF/ANSI 42 Standard. After advanced upgrade, the model number is changed from AQU-DW80/90 into AQU-WF60-80/90. Superior Materials：AQUACREST uses food-grade plastic housing to free you from worrying about impurity leaching back to your water. Specially selected premium materials are lead-free, which is fully tested and certified by IAPMO against NSF/ANSI 372 standard. Perfect Fit For The Original System：This replacement filter is designed to fit with your original system, providing you with great water experience without worrying about water leakage. Stable Flow Rate And Long Service Life: The fast yet stable water flow is another advantage for further filtration. Enjoy refreshing taste by changing your filter every 6 months or 11,000 gallons. Still, it depends on your local water quality. Fits The Following Models：Aqua-Pure AP-DW80/90; AP-DWS1000; KOHLER K-202-NA Aquifer Premium; KOHLER K-201-NA Aquifer High-Flow, KOHLER K-200-NA, KOHLER K-20852-NA. AQUA CREST DW80/90 Under Sink Water Filter, Replacement for Aqua-Pure AP-DW80/90, AP-DWS1000, Kohler K-201-NA, Kohler K-202-NA, NSF/ANSI 42 Certified, 2 Pack, Model No.WF60-80/90