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Hortishop Claremont

Tel: 021 671 9447 


125 Belvedere Road

Tel: 082 502 3902

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Shop 5A, De Bron Centre

Gardener Str
De Tuin, Brackenfell


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Why is it important to use filtered water in hydroponics?

The plants in our gardens acquire the nutrients they need from soil, but as we all know from time to time extra nutrients are necessary to improve growth.  When adding nutrients it is best practice to use purified water.

Sarah Pick

The kinds of tap water we use vary from hard to soft, and due to this the type of water employed in a hydroponic system has to be uniform. In short, water filtration gets rid of all the minerals in water to supply a neutral base to use your nutrients.  This is achieved through the use of filtrated water and from this you are more likely to get optimum success from your nutrient solution and obtain optimum growth in your crops.

All tap water has minerals within it and these are amassed when the water seeps through rock and soil groups as it travels. The quantities of these minerals are assessed in ppm (parts per million) and purified to a harmless amount by water companies.  Even so, drinking water differs based on the area you live in, with mineral content of many waters ranging from 150-420 ppm. This additional mineral content may present a challenge when adding nutrients to solution in hydroponics.

Most nutrients state on the instructions to make up a solution (based upon on the number of plants) to a certain ppm for instance 1500 ppm. Therefore if the water you are using already has a content of 200 ppm it can be challenging to resolve this in your nutrient level. The water has a mineral content of 200 ppm yet for a lay person it is hard to know what levels of minerals are within it, and this is when water filtration systems come into their own.

Reverse osmosis water purification systems, filter out the minerals in the water bringing the end water product to 0 ppm. This is produced by eliminating large molecules such as calcium and magnesium by forcing the water through a membrane layer. Different filters work on different water types and the sort of water in your region is found on local water companies or environment agency websites, or by getting a water testing set. A lot of gardeners and hydroponic gardeners employ these filters, as they are aware that the filtered water used in the system obtains maximum success from the nutrients in the solution, and generates the best conditions for greater growth in crops.