Arka myAQUA 400 is a professional osmosis system with booster pump and In-Line TDS meter. This powerful reverse osmosis system supplies up to 400 litres of the purest osmosis water per day - ideal for freshwater and saltwater aquariums where the highest water quality is crucial. A resin filter for removing the finest residues of silicate, nitrate and many other dissolved organic or inorganic substances (TDS) is optionally available.