A. Multipure’s solid activated carbon block filters are replaced six-months to one year for a family of four depending on water quality and usage, at an average cost of about $5.00 per month or a little more than $1.00 per week. On average, Multipure filters can handle 600 gallons to 750 gallons of water. Adding an electronic capacity monitor to Multipure’s Aquaversa drinking water system significantly increases the filter’s capacity from 750 gallons to 1,200 gallon (960 gallons for Aquaperform), providing additional cost savings. The filter capacity for Aquasource whole-house point-of-entry Drinking Water System is 30,000 gallons using three filters.