The Aqua-Pure AP-DW 80/90 is a replacement filter cartridge for POU (point-of-use) under-the-sink, drinking water systems. These filters are in high demand from households that get their drinking water from untreated sources. Designed as easy-to-replace cartridges, a set of cartridges is needed by both the drinking water systems they were designed to work with, the AP-DWS1000 and AP-DWS1000LF.The replacement cartridges comprehensively eliminate the taste and odor of chlorine from drinking water. They are also efficient at eliminating lead, VOC (Volatile Organic Compounds), MTBE, turbidity, and parasitic protozoan cysts. This ensures the presence of clean, good-tasting drinking water even if your home has hard water.The average flow rate for POU water systems is 0.6 gpm (2.3 lpm), which is sufficient for most household requirements.