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DIRECTIONS: Shake well before using. Five days prior to changing your spa water, remove the filter(s), add one full bottle of the Penetrating Spa Cleanser directly to your existing heated spa water regardless of what products you have previously used.Two (2) bottles are suggested if the spa is over 5 years old or over 500 gallon capacity. Circulate a minimum of 8 hours each day for 5 days. Drain spa and flush with clean water. Clean filter(s) separately. Spa should not be used during the cleansing process because of contaminants and residues from spa plumbing, fittings and equipment.