iSpring F9D 1-Year Replacement Filter Set for DI RO Water Filter, Fits iSpring RCC7D RCW7D RCC7D2 (9pcs 2SED 2GAC 2CTO 1T33 2Di, no membrane) 9 pieces of 10" x 2.5" Replacement Water Filters included, good for One Year Supply Individually wrapped to keep freshness Fits iSpring RO DI Systems and most other brand name RO DI systems Reduces RO water's TDS level to 1ppm-0ppm; Perfect for aquarium, reef and fish tank