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Sanitisers
Sanitising agents come in a number of different kinds, which one is right for you depends mainly nature of your local water supply.
Maxi tabs and mini tabs are stabilised chlorine (trichloro isocyanuric acid) which will reduce the alkalinity and the pH. Use them in hard water areas. They can be placed in the skimmer or in a floating dispenser where they dissolve slowly.
Stabilised chlorine granules (sodium dichloro-isocyanurate) does not reduce pH and alkalinity so they are best used in soft water areas. Mix up with warm water in a plastic bucket and add to the pool.
Bromine tablets do not reduce pH or alkalinity. They do not smell of chlorine. They can be placed in the skimmer or in a floating dispenser where they dissolve slowly.
Please be careful with all these chemicals as they will bleach your clothes.
Shock
Shock treatments are used every two weeks during the pool season to break-up accumulated pollutants in the pool water. It is especially important in keeping outdoor pools free from algae.
Chlorine shock (calcium hypochlorite granules). Use on most large swimming pools. Mix with warm water in a plastic bucket and add to the pool every two weeks. Leave overnight before using the pool.
Oxygen shock (potassium peroxysulphate). It is quick acting and does not smell of chlorine. Used on jacuzzis and hot tubs. Dissolve in water in a plastic bucket and add directly to the pool water. Leave for 30 minutes before using the pool.
Pool Water Balancers
It is important to keep your pool water balanced, by controlling the acidity. Balanced pool water is essential for your sanitiser to work properly and keep the pool bug free and also to protect the pool fabric from damage. There are essentially two ideas involved in balancing pool water. Firstly the pool water must be brought to the correct acidity, or pH, usually between 7.2 and 7.4. This is done by adding pH plus if the pool water is too acid (pH less than 7.2) or pH minus if the pool water is too alkaline (pH more than 7.4). Secondly enough bicarbonate and calcium must be kept in the water to keep the pH stable, using Alkalinity Builder and Calcium Builder.
pH minus (sodium bisulphate). It is used to reduce the pH of pool water to between 7.2 and 7.4. It is required in hard water areas if chlorine granules or liquid chlorine are used. Mix with warm water in a plastic bucket and add directly to the pool.
pH plus (sodium carbonate). It is used to increase pH of pool water. It is required in pools using maxi or mini tablets (trichloro isocyanuric acid). Mix with warm water in a plastic bucket and add directly to the pool.
Alkalinity Builder (sodium bicarbonate). It stabilises the pH of the pool. It is required in soft water areas. Add directly to the pool and agitate with pool brush to dissolve.
Calcium builder (calcium chloride). It is used to increase the calcium level in soft water areas. A shortage of calcium will lead to pool grout marbelite and concrete being dissolved by pool water. Add directly to the pool and brush to dissolve.
Algaecides
Algae will build up in the pool especially if you do not maintain a good level of chlorine or bromine in the water. These build-ups can turn your pool water green and produce slimy films on pool services. Algaecides are added to the pool when it is filled and a smaller amount each week to prevent the build up of algae. If there is a severe build up of algae it will be necessary to shock the pool at the same time as adding algaecide.
Clarifiers
Used to treat cloudy water and keep your pool sparkling clear.
Hard Water Areas - Chlorine Tablets, pH minus, Shock, Algaecide, Sparkle, pH / Chlorine tester or test stripsSoft Water Area - Chlorine granules, pH plus, Alkalinity Builder, Shock, Algaecide, Sparkle, Balanced water tester or test strips.
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