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TOTAL ALKALINITY

The alkalinity of your swimming pool is arguably the most important water balancing level in your water to manage, and is a must-know item when owning or maintaining a pool. Alkalinity is a term that describes how well the water acts as a buffer against changes in pH and describes how well the water neutralises acids in your swimming pool water. To maintain the alkalinity of your swimming pool water you measure the total alkalinity and adjust this level if necessary.

RAISING LOW TOTAL ALKALINITY
Sodium bicarbonate (bicarb) will raise the total alkalinity without excessively raising the pH. You should try to increase the total alkalinity over a period of time, adding a maximum of 1 kg of alkilinity booster for each 50 000 litres of water. When the total alkalinity is too high, the following can occur:
   •   pH spikes despite regular addition of pH-down
   •   cloudy water
   •   burning eyes and itchy skin
   •   reduced chlorine efficiency resulting in algae growth
 

LOWERING HIGH TOTAL ALKALINITY
To lower a high total alkalinity over a period of time, you should:
   •   turn off the pool pump and allowing the water to settle
   •   slowly add the pH-reducer (hydrochloric acid) into one spot in the deep end of the pool
   •   allow the chemicals to "burn off" some of the alkalinity for 15 - 30 minutes
   •   turn the pool pump back on and allow the water to mix thoroughly

After about 24 hours, you should retest the total alkalinity level in your pool. It will take about this long for the water to balance to any chemicals you have added.

Maintaining the alkalinity of your pool is relatively easy, as this level does not change quickly, and several products are available to easily test and adjust the total alkalinity. Keeping your swimming pool alkalinity in-check goes a long way to maintaining a healthy and balanced swimming pool to be enjoyed by everyone

 

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