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 320 gallons or up to 6 months of routine use Retains minerals like calcium, potassium, and magnesium for the healthiest water Replacement filter pack (2 Piece Count) for Aquasana Clean Water Machine: AQ-CWM
