A. Compare a national brand name that sells its best water filter for $49 for 100 gallons that is not certified by NSF at an expensive price of $0.50 per gallon, against Multipure NSF-certified water filters that meet or exceed NSF standards 42 and 53 that can produce up to 1,200 gallons of purified drinking water for $70.00 “per replacement filter” or $0.06 per gallon ($70.00/1200), which is the same as $0.01 per liter ($0.06/3.785).  With the popular brand, you change filters 12 times per year and pay $588 for 1,200 gallons of water that might not be certified by NSF, compared to $70.00 for the same volume of Multipure filtered water that is certified by NSF to meet standards 42 and 53, a cost saving of $518 for a family of four over a one year period.