This high-quality reverse osmosis membrane is designed to provide ultra-pure water for saltwater aquariums, removing up to 99% of impurities such as calcium, sodium, magnesium, and other harmful substances. Made in the USA, this TFC (Thin Film Composite) membrane operates efficiently across a wide pH range from 2 to 12 and handles temperatures up to 110 degrees Fahrenheit. It fits standard residential membrane housings and is ideal for use with RO/DI systems commonly employed in reef aquarium maintenance. This product is essential for aquarists who prioritize water purity and the health of their marine life, ensuring that only the purest water enters their delicate saltwater ecosystems.