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The hardness of water can be just as critical to the well being of an aquarium as pH. In fact with many fish it can mean the difference between good health and poor health, or death. The HARDNESS test kit measures total hardness and uses the Australian way of measurement, ppm, so it is very easy to understand. It measures in steps of 10ppm which means more accuracy. The kit also has a colour chart so you know what colour you should start off with and what the final result should be
