Reverse osmosis water is often used to replace evaporated aquarium water. Reverse osmosis does not only remove harmful substances buy also valuable minerals. With Tropic Marine 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 stabilised. Kalkwasser for example only adds calcium, whereas Tropic Marine Re-Mineral Marine provides all trace elements and minerals in the natural composition of the sea.Each pot contains a spoon and spatula for exact measuring.Directions for Use: Ensure that you use the spoon to measure a precise amount of Tropic Marine Re-Mineral Marine. Use the spatula provided to wipe over the spoon and leave the powder. Sprinkle one measuring spoon full onto the surface of the reverse osmosis water whilst stirring the water. Wait for each spoonful to dissolve before adding more Re-Mineral Marine.Dosage: One level spoon for 15 litres of water.