Water Treatment with Chlorine

Chlorine:

There are 2 types of chlorine - stabilised and unstabilised. Stabilised chlorine contains cyanuric acid that reduces the loss of chlorine due to the action of sunlight and so is widely used in outdoor pools. Unstabilised chlorine will need to be added on a daily basis and can be stabilised by the direct addition of cyranuric acid to the pool.

Liquid, Granular or Tablete format?

Chlorine can be obtained in liquid, granular and tablet forms. They are all either poured as a liquid, broadcast as granules or dissolved into the pool water.

These types should NEVER BE MIXED before use and each type must be used in a different way.

Liquid and Granular Chlorine

Always follow the instructions provided with the chlorine. It will involve testing the water, measuring out the dry chemicals or liquid, pre-dissolving (granules) in a watering can and pouring the solution around the perimeter of the pool (never into the skimmer directly). You will need to test the pH and add pH stabiliser at the same time.

Chlorine Tablets

Chlorine tablets should be used with a chlorinator.

This gives more control over the rate of dosing as the rate of tablet dissolution depends on the amount of water pumped through the chlorinator by the pool circulation pump.

A chlorinator will reduce the daily pool maintenance work. But the pH and disinfectant residual should still be checked on a daily basis and the water treated as requied.