Some salt suppliers claim their products are 99 percent salt. If it is this pure, how can the choice of salt make a difference in swimming pools?
Salt is added to fresh water pools at levels of 3,000 to 4,000 parts per million, so a 20,000 gallon pool will require 530 pounds of salt at startup (to achieve 3,200 parts per million). With quantities that large, even salts that claim 99 percent salt can add up to 5.3 pounds of contaminants in the pool. These contaminants can slow dissolution rates and cause staining, scaling, cloudy water, and chlorine demand, so it’s important to know the quality of salt in use. Small quantities of contaminants can make a big difference.
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