Correct ph-value in the pool

The word pH comes from the Latin term potentia Hydrogenii and represents the acidic or basic effect of water. For the operation of a pool it is a decisive key figure. The scale ranges from 0 to 14. At a value of about 7, neutrality is maintained; if it is below that, the water is acidic. A higher determination means alkalinity.

Every liquid – whether organic or inorganic – has a pH value. For example, blood is relatively neutral at 7.4, beer is around 5 and is acidic, and caustic soda is alkaline with a value of 14. For the human skin, which itself has a pH value of 5.5, the same measurement is skin neutral.

Measuring and evaluating the pH value in the pool

As a basic prerequisite for water disinfection, the pH value in the pool must first be measured. This can happen in two ways:

  1. With test strips or tablets
  2. with a measuring device

With the test strips, the indicator changes color depending on the water quality. Neutral means a rich yellow, while anything in the red and orange ranges is acidic. Blue and green discoloration indicate an alkaline pH in the pool. The measurement should be taken at least once a week, because the water quality can change quickly due to external environmental influences and regular use. Warm weather and hot temperatures also affect the pH value in the pool. So if there are deviations, you need to take countermeasures to get neutral water again.

pH value in the pool too high

There can be many reasons why the measurement of the pH value in the pool suddenly turns out to be much too high. If algae occurs or if sanitizers and other supporting chemicals have been misapplied, the pH in the pool will rise, encouraging further algae growth and harmful water quality. You can also recognize this by the following characteristics:

  • Skin and eye irritation
  • milky cloudy water
  • Calcification
  • rough pool walls
  • Unpleasant odor
  • Flocculant no longer works

In two steps you can now determine the water quality and, if necessary, lower the pH value again.

  1. Determine the pH value in the pool: To do this, hold the tester or test strips in the water according to the manufacturer’s instructions and wait for the reading to appear.
  2. Calculating the minus average: Depending on the value, the lowering must be done in steps of 0.1. If the value is 7.8, the perfect mean value of 7.2 is subtracted and you must now add the pH-minus remedy to the water six times at 0.1 each time. Wait until it has completely dissolved before you continue. Test the pool water again.

If necessary, you then add fresh water and ensure a backwash of the filter pump. Not to forget is a renewed disinfection with chlorine or active oxygen.

Pool construction at Liquipipe

We at Liquipipe are specialists in all aspects of water technology in the home and garden. Whether for watering plants or building a new heating system, we will be happy to advise you and offer you a wide range of products in our online store at everything you need for installation.

You will find pipes, hoses, connections or pumps to supply your property with water in an optimal and cost-efficient way. Also for your dream pool, you will discover a wide range of pool liners and accessories that are indispensable for maintenance and cleaning.

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