Sodium Hypochlorite is the chlorine disinfectant most commonly used in UK swimming pools. It's supplied in liquid form and is similar in appearance to household bleach, which itself contains approximately 5% Sodium Hypochlorite. It is possible to produce Sodium Hypochlorite on-site by passing an electrical charge through a solution of Sodium Chloride (salt water).

 

The benefits of this type of system are that there is no direct handling of hypochlorite chemicals and there will be reduced amoun...
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If you've ever seen a swimming pool being emptied, you will have noticed that as the volume of water decreases, so does the 'blueness' of the water. Why is this? Well, basically, water absorbs light. You probably already know that light at wavelengths that are visible to humans is made up of the seven colours of the spectrum, ie. Red, Orange, Yellow, Green, Blue, Indigo, Violet. Water absorbs light at shorter wavelengths first, so the red gets absorbed and is therefore not visible. The blue i...
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