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  The most popular chlorinating compounds are hypochlorites, like sodium hypochlorite and lithium hypochlorite:  https://en.wikipedia.org/wiki/Hypochlorite . These break up easily in water, releasing pure chlorine, and the other elements don’t do much in the water. The alternative solution for chlorinating and disinfecting is saltwater pools. These use a small elecrolyser that splits the salt into sodium and chlorine. This allows owners to fill up the reservoir of salt just once or twice a season, and then the salt will slowly be turned into just enough chlorine to keep the water disinfected. Normal pool care requires chlorine refills every few days, and more powerful chlorine “shocks” every two weeks or so, so saltwater pools have a clear advantage, but they’re more expensive to install and replace. Closing Pool Chemicals The chemicals used to close a pool are slightly different from the ordinary ones. You can find a few examples at  Watson’s closing pool chemicals.  Some of these are