Highest quality American made Culligan compatible reverse osmosis membrane for the H5 system. It produces 10 gallons per day of fresh and clean tasting water for drinking water, cooking, pets, and plants. We also have in stock the carbon block and inline filters for this model. Exceptional value and performance. It also can replace part numbers: 00442845, 01008256, 1224433, and the cta-16-c.