How to measure the pH level?

09 March 2018

Kan je geen keuze maak uit het eindeloze aanbod waterkwaliteittesters en stel je daardoor het meten van de waterkwaliteit uit. Dan kan je last krijgen van groen of troebel water. Het meten van de waterkwaliteit is dus een absolute must! Om het je wat gemakkelijker te maken, hebben we hier een overzicht geschreven met een beschrijving van elk van onze digitale waterkwaliteittesters.

Our review: pH meters

To measure the chlorine and pH levels of your swimming pool, you can use a variety of pH meters. To measure the pH level, you use test strips.  For the analysis of the measurement results you can either rely on your all-seeing eye or use a digital meter.

Whilst a digital pH and chlorine meter obviously costs slightly more, this is more than offset by the ease of use. You simply insert the test strip into the device and read the result a few seconds later. Such a digital tester also provides immediate advice.  After measuring the pH level, it tells you whether you have to add pH powder or chlorine to the water. 

You can, however, also measure the pH level of the pool and do the analysis yourself. The test strip will in fact change colour, after which you can analyse the colour value. This colour value is then used as basis to determine the quantity and the type of pH powder to be added.

A digital pH meter would therefore seem to be the best solution. You should, however, ensure that it is calibrated at regular intervals, otherwise the accuracy of the results may be affected. 

Aquachek Digitale water tester

Ideal pH value for swimming pools

Once you have measured the pH level of your pool, you need to determine whether pH Plus or pH Minus should be added. The pH schedule for pH Minus and pH Plus is presented below. It clearly shows when you need to add which powder.

Dosing schedule pH Min

Pool volume

20 m³

50 m³

75 m³

100 m³

Per m³

7.2 to 7.6

   

Ideal value

 

 

7.6 to 8.0

120 g

300 g

450 g

600 g

6 g

8.0 to 8.4

240 g

600 g

900 g

1200 g

12 g

pH > 8.4

360 g

900 g

1350 g

1800 g

18 g

Dosing schedule pH Plus

Pool volume

20 m³

50 m³

75 m³

100 m³

Per m³

7.2 to 7.6

   

Ideal value

 

 

6.8 to 7.2

180 g

450 g

700 g

900 g

9 g

6.5 to 6.8

240 g

600 g

900 g

1200 g

12 g

pH < 6.5

300 g

750 g

1100 g

1500 g

15 g

 

If a pH level between 7.2 and 7.6 is measured, you do not need to add anything. This is an ideal pH level, so you can safely add chlorine products. These products only achieve their full effect if an ideal pH level is present.

Why measure pH?

Measuring the pH level is very important. If you do not know the pH level, you cannot correct it using the appropriate products.  And an inadequate pH level may have serious consequences.

Too high a pH level  may, for example, render the free chlorine inactive. As a result, the water is no longer disinfected and bacteria can easily spread in the swimming pool.

If an excessively low pH level is measured, immediate action is required. An excessively low pH level can in fact cause corrosion to your filter pump, heat exchanger, etc.

Is there anything else you would like to know about measuring the pH level of your pool? Do not hesitate to contact us! We will be happy to help.

Why measure pH?