The Claryum® 2-Stage under sink water filter instantly transforms your ordinary tap water into clean, great-tasting water for 500 gallons or up to 6 months. Aquasana's Claryum® filtration technology is tested and certified to NSF/ANSI Standards 42, 53 (includes P473), and 401, for the reduction of over 97% of chlorine and chloramines, 99% of microplastics and lead, and 96% of PFOA/PFOS. It's also certified to reduce mercury, chlorine-resistant cysts, herbicides, pesticides, VOCs, pharmaceuticals, and more. In all, it tackles 15X more contaminants than the leading pitcher filter. Claryum®'s selective filtration technology retains naturally occurring beneficial minerals found in water like calcium, potassium, and magnesium for healthier, more delicious water. Our under sink water system features two powerful filters, combining powerful activated and catalytic carbon with ion-exchange and sub-micron filtration for premium water filtration. The Claryum® 2-Stage will alert you when it's time to change your filters. Filter replacements are engineered to be quick and painless. Our Claryum® 2-Stage under sink water filters comes with a step-by-step installation guide that features photos, illustrations, and measuring guidelines. Product Specifications: Operating Pressure: 20-80 psi Operating Temperature: 40-90°F Rated Service Flow: 0.5 gpm Maximum Capacity: 500 gallons System Dimensions: 4.25" x 8.25" x 9" (L x W x H)