High chloramine levels are responsible for eye-sting and the unpleasant, stale chlorine smell that many people associate with old-fashioned swimming baths.

In order to eliminate chloramines it is necessary to use a shock treatment to super chlorinate the pool with a high dose of free chlorine.

 In addition at some stage, chlorine levels may have fallen, or chlorine has become ineffective allowing algae to become established in the water. By utilising a shock treatment, it will in fact kill the algae.

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