WATERRO CORALIS 100G-H1812 reverse osmosis system (membrane in housing) WATERRO CORALIS 100G-H1812 is a compact reverse osmosis system specially designed for freshwater, marine and reef aquariums that require clean, stable water. It effectively reduces dissolved salts, chlorine, nitrates, phosphates, heavy metals and other impurities, providing high-quality RO water for aquarium use. Filtration begins with a WATERRO Inline QF 2.0″ PP 5 μm mechanical filter and a WATERRO Inline QF 2.0″ GAC Carbon filter, which remove particles, chlorine and organic contaminants while protecting the reverse osmosis membrane. Main purification is provided by a WATERRO WR-1812-100 reverse osmosis membrane with capacity up to 100 GPD, producing high-quality RO water for aquariums. The system operates without a booster pump or storage tank, making it economical, quiet and easy to install where water pressure is sufficient. Its compact design and inline filters make maintenance and filter replacement convenient. WATERRO CORALIS is an excellent choice for aquarium enthusiasts seeking a reliable and affordable system for obtaining pure RO water and maintaining a healthy environment for fish, corals and other aquatic organisms.