Ensures your Evolution RO1000ƒ?› runs more efficiently. Less filter changes and maintenanceƒ??every 7,500 gallons of product water. Cleanable sediment filter is reusable. Combination of KDF85 and KDF55 with earth-friendly catalytic carbon filter reduces chlorine, chloramines, iron, sulfur and heavy metalsƒ??great for city or well water. Highly recommended when using more than 150 gallons of purified water per week average.