If you are a pool owner you will know that you need to regularly shock your pool to ensure that the pool water remains clear and hygienic for swimmers. Pool shock removes unwanted chlorine by-products (called chloramines or combined chlorine) and returns the chlorine levels in the pool to safe levels. Shock treatments are also used for pools using bromine and ozone and the primary sanitizer.
Shock treatments are available in either liquid or granular form. The latter tends to have a longer shelf life which allows you to buy in bulk and save money. Liquid pool chlorine shock is the product of choice for pools that have surfaces that are prone to bleaching. With granular shock there is always the risk that the shock treatment does not fully dissolve before coming into contact with the pool liner.
The amount of shock that you will need to use will depend on the size of your swimming pool (typically measured in gallons) and the levels of combined chorine chlorine in the pool. You should also shock your pool more often if it is being used heavily, after periods of heavy rain or strong sunlight.
The best time to shock treat your pool is in the evening when the pool is no longer in use. This will allow the pool chemistry to balance out overnight. Check the chlorine levels in the morning before you allow swimmers to enter the pool.
There are four main types of pool shock on the market. The most commonly used has Calcium Hypochlorite as its main ingredient. The available chlorine levels can vary considerably between products and brands so check this carefully before purchasing. Sodium Di-chlor and Lithium shock treatments are also popular. The former is stabilised with Cyanuric Acid so it is important to ensure that the stabilizer does not build up to unsafe levels. Sodium Hypochlorite is the ingredient used in most liquid pool shock treatments.
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