WATERRO AQUARIUS 100G-H1812-DI reverse osmosis system (Membrane in housing) WATERRO AQUARIUS 100G-H1812-DI is a professional reverse osmosis system designed for freshwater aquariums, marine aquariums and reef aquariums where exceptionally pure water with minimal total dissolved solids (TDS) is required. The integrated deionisation (DI) stage provides premium-quality RO/DI water for sensitive corals, invertebrates and demanding fish species. The system uses SLIM 10" pre-filters, providing effective mechanical and carbon filtration before the reverse osmosis process. Primary water purification is performed by the WATERRO WR-1812-100 reverse osmosis membrane with a capacity of up to 100 GPD, while the SLIM 10" deionisation cartridge completely removes remaining ions and minerals, producing exceptionally pure RO/DI water. The system operates without a booster pump or storage tank, making it economical, quiet and easy to maintain. Standard SLIM 10" filter housings allow filters to be replaced easily and help reduce operating costs. WATERRO AQUARIUS is a reliable solution for aquarium enthusiasts and professionals who want to ensure the purest possible water and a stable environment for their aquariums.