Go to any store selling pool chemicals and you’ll see rows and rows of pool shock treatment for sale. Some will be chlorine shock, others non-chlorine shock. You’ll find liquid pool shock, granular shock as well as shock in tablet form. The variety can be a little bewildering, so in this article our goal is to provide you with the information you need to guide your decision making.
First, a little background. Pool shock is designed to raise the free chlorine levels in the pool, at the same time getting rid of chlorine by-products or chloramines. Chloramines do not have as much disinfectant power as free chlorine and can also cause eye irritation and an unpleasant odor. Most pool experts recommend using pool shock once every two weeks when the pool is open. You can bring this rate up to a weekly shock treatment if the pool is being heavily used.
The dosage of pool shock you will need will depend on two main factors. The size of your swimming pool in gallons and the level of chloramines (combined chlorine) in the pool. In addition, if the pool water looks murky or green, then this is an indication that you will need more pool shock.
Although liquid pool shock is more expensive than granular or powdered shock when comparing the percentage of chlorine, if you have a vinyl liner that could be damaged it makes sense to stick with a liquid product. This reduces the risk of un-dissolved chlorine particles falling to the floor of the pool and bleaching it. Purchasing non-chlorine swimming pool shock treatment is also a good idea if you have sensitive pool surfaces. Non-chlorine shock is also the preferred shock of choice for spa owners. Both chlorine and non-chlorine treatments are compatible with chlorine, bromine and ozone sanitized pools.
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