WQA Tested and Certified to NSF/ANSI Standards 42, 53 (includes P473) and 401 Removes up to 99% of 78 contaminants including chlorine, lead, mercury, and more Replace filters every 300 gallons or up to 6 months of routine use Retains minerals like calcium, potassium, and magnesium for the healthiest liquid Replacement filter 2-pack for the new Aquasana Clean liquid Machine: AQ-CWM2-B
