Essential minerals lost during reverse osmosis and de-ionising water treatments are returned to the water by Tropic Marin Re-Mineral Marine. It raises and stabilises the carbonate hardness and is also suitable for the preparation of tap water, which is too soft. Tropic Marin Re-Mineral Marine for sea water does not contains any other products and no natrium chloride.Tropic Marin Re-Mineral Marine+ minerals for hardness increase of reverse osmosis water and for soft tap water+ the water gets back all minerals that get lost during the reverse osmosis process+ provides all trace elements and minerals in the natural composition of the sea, whereasKalkwasseronly adds Calcium+ alkalinity is raised and stabilized+ suitable for aquarium conditioning of soft tap water+ without sodium chloride (NaCl)Use of Tropic Marin Re-Mineral Marine:Add one level measuring spoon full for 4 US gal./15 l of water. Ensure that you use the enclosed spoon to measure a precise amount of Tropic Marin Re-Mineral