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To allow your plants to thrive, the maintenance of the mineral water hardness is very important, since soft water halts biological processes and leads to the acidification of the water environment. A pond environment can only be stable and healthy if the total mineral hardness is at least 8° DH. The Velda mineral plus pond additive is a very effective means of increasing the mineral hardness of your pond. It is essential for the growth of aquatic plants and the development of micro-organisms, let alone adjusting the mineral balance. This 1500 ml bottle of Velda Mineral Plus is suitable for treating 9000 litres of pond water.