Velda 6-in-1 Water test strips 50 pieces 121519

Maintaining water hardness (GH value) is very important to allow your fish and plants to grow and develop and to provide them with a stable pond environment. However, biological processes in the pond can reduce water hardness. An ideal hardness is between 8-12° GH. The Velda GH plus pond additive is a very effective means of increasing the overall hardness of your pond. The solution consists largely of calcium, magnesium sulphates and other important minerals to ensure that the environment remains stable so that growing plants and soil bacteria can develop unhindered. This 1000 ml GH plus bottle is suitable for treating 10,000 litres of pond water.