iSpring Reverse Osmosis RO DI Replacement Filter 10" set for Reef / Aquarium - from 123filter 5-piece set of replacement filters for reverse osmosis DI systems, individually wrapped in films for freshness. Fits most standard 10 housing reverse osmosis DI water filter systems. Compatible to most RO DI systems on the market Fits iSpring RO DI system #RCC7D and #RCC7DT