Technical

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Managing the quality of the bathing water in your pool or spa is normally controlled by several important parameters :-

1) Chlorine Level  - Ideally maintain a Free Chlorine level of 1-2 mg/L. You can use the Palintest DPD method and photometers to measure and manage this.

2) pH level - A pH between 7.2 and 7.8 is OK. Preferably between 7.4 and 7.6 is suitable for most types of Pool.  pH levels control the chemical balance in the pool. If the pH level is too low the water becomes acidic, Chlorine residuals disipate rapidly, eye irritation, corrosion of metal fittings and rapid loss of alkalinity will occur.

If pH is too high then the Chlorine activity becomes inefficient, scale formation, cloudy water and eye irritation can occur.

3) Alkalinity  For balanced water, Total Alkalinity should be maintained between 100-150

4) Calcium Hardness  For Balanced Water, this parameter should be maintained between  175-250

Free Available Chlorine - is defined as that residual chlorine existing in water as hypochlorous acid and hypochlorite ion.

Combined Chlorine - is defined as that residual existing in water as in chemical combination with ammonia or organic nitrogen compounds.

Chlorine Demand - is defined as the difference between the amount of chlorine added to water and the amount of free available chlorine remaining at the end of a specific contact period.