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Important: Prior to each application, ensure that the carbonate hardness (KH) of the water is higher than 3°dH (for instance using the Tetra Pond Test 6in1). If the level is too low, it is advisable to increase the water's carbonate hardness in a controlled manner by using a product such as Tetra Pond pH/KH Plus. Dosing instructions: Use the measuring cup to add 50 ml of Tetra Pond CrystalWater for every 1,000 litres of pond water. For best results, ensure that the product is mixed thoroughly into the pond water. Keep out of the reach of children!