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Clear and perfect water with half the work! Pool Magic helps to prevent winter waterline ring, preserves pool liners, finishes, reduces staining, and the need for acid washing.
Applying Pool Magic when closing your pool, provides a residual level of enzymes in your water over the off-season -- which prevents waterline rings from forming. Refilling the pool upon opening in the spring helps to dilute the enzyme concentration, so the additional spring or opening dose is necessary for fresh fill water.