Protect Your Home's Water: The hydrotech 33001056 reverse osmosis (ro) compatible membrane is the most important component in your ro system and provides ultra fine filtration. This membrane forces pressurized water through a thin film composite media to greatly reduce the total dissolved solids and inorganic contaminants in the water. Does your water have a poor taste or appears cloudy? Replace the filter membrane and enjoy cleaner, healthier, and better tasting drinking water.