The Aquasure AS-FP1000 Fortitude Pro Series Whole House Water Filter System provides clean healthy water for the entire home by removing a wide range of chemical and organic contaminants from water. The Fortitude AS-FP1000 offers 1,000,000 gallon capacity for a household with 3-4 bathrooms. It also features a 1 inlet/outlet to ensure almost no reduction in water flow.