Maintaining a general hardness of water of at least 8 degrees of hardness helps to keep the biological processes working properly thus avoiding stagnation and acidification. The calcium and magnesium forming the general hardness of water are essential for the proper growth of plants and aquatic micro-organisms which consume unicellular algae and help to keep the water clear.
3 litre treats 20,400 litres (4500 gallons)
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