The Importance of Balancing the Pool Water

Swimming pool environments are dynamic systems where conditions constantly change. The application of chemicals, water replacement due to evaporation and splash out, bather waste, environmental debris and rainfall all affects the waters chemistry. Many people think that if pool water looks blue it is protected from bacteria, swimmer waste and algae, but to fully ensure that the pool water is protected from bacteria and other contaminants it needs to be tested regularly. 

Why is water balance Important?

  • Key to effortless pool care – Better looking water, water does not become cloudy and unappealing for swimmers.
  •  Ensures an enjoyable pool – Better feeling water, unpleasant odours, burning eyes and itchy skin is prevented.
  •  Protects the investment – The pool finish and equipment is protected from staining or scaling.
  • Save on unpredicted costs – Chemicals work more effectively in water that is properly balanced ensuring healthy, algae free water.


Water Balance Parameters


Recommended Range


7.4 – 7.6

Total Alkalinity


80 – 125 ppm (Plaster)

125 – 150 ppm (Fibreglass)

Calcium Hardness


225 – 275 ppm (Plaster)

175 – 225 ppm (Fibreglass)


< 40°C

Total Dissolved Solids


< 1,500ppm

(does not apply to salt pools)


> 40ppm

Iron, Copper, Manganese

0 ppm


How to take an accurate water sample:

  • Use a clean, uncontaminated water sample bottle
  • Get the sample elbows-length deep in the pool
  • Do NOT get the sample from in front of a return jet

Proper water testing will help detect any problems that might be developing, which – when detected early – can be resolved easily so you can avoid headaches down the road.

Weekly you should test the water yourself; here are some tips to help achieve accurate results:

  • Always start with a clean testing vial and fresh reagents.
  • Test chambers should be rinsed with clean water after each use, and liquid reagents should be replaced at the beginning of each swimming season. Foil-wrapped tablet reagents are good for up to three years. If you are using test strips, they should be replaced at the beginning of each swimming season.
  • Test the free chlorine level using DPD # 1 tabs. The ideal level is between 1.0 ppm and 3.0 ppm.
  • Test and adjust the pH. The correct range is 7.4 to 7.6. These are probably the 2 most important test for your pool.
  • Every 4-6 weeks, take a 1 litre sample of your pool water to your nearest BioGuard Pool & Spa Stockist for a free computerised water analysis.

A computerised water analysis not only determines the pool’s pH balance, total alkalinity and calcium hardness, but it also detects levels of sanitizer, the presence of swimmer residue (suntan oils, hairspray, etc.), mineral imbalances and the possibility of algae and other contaminants. Either way, be sure to stay ahead of problems with frequent water testing as both you and your pool will be all the happier for it. BioGuard provides all the chemicals required to balance the pool water correctly.