Tetra Pond CrystalWater rapidly clears dirty pond water. - Quickly clears murky brown water. - Clumps particles so they sink or are more easily removed by the filter. - Safe for fish plants and wildlife. Add 50ml of CrystalWater per 1000 litres (220 gallons) of pond water. Use the dosing cap provided. For even distribution mix the required amount in a watering can full of water and pour over pond surface. Not suitable for use in very soft water (carbonate hardness below 2JdH). If soft water conditions are likely (e.g. in soft water regions following periods of heavy rainfall use of rainwater in pond etc) please check carbonate hardness before use. Shake well before use always read instuctions carefully. Available in 250ml 500ml Bottles.