Minerals for water of reverse osmosis and for soft tap water. Reverse osmosis water is often used to replace evaporated water of the aquarium. But reverse osmosis does not only remove harmful substances but also valuable minerals. With Tropic Marin Re-Mineral Marine the water of reverse osmosis gets back all its beneficial natural minerals and substances. At the same time the alkalinity is raised and stabilized. Kalkwasser for example only adds Calcium, whereas Tropic Marin Re-Mineral Marine provides all trace elements and minerals in the natural composition of the sea. Re-Mineral Marine is also excellent suitable for aquarium conditioning of soft tap water