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Relax Scale and Metal Magnet Tablets are highly concentrated tablets formulated to prevent pool surface discolouration. Scale and Metal Magnet works by sequestering minerals, thus preventing unsightly calcium and metal deposits from precipitating on you pool walls and floor. Foe effective use, place tablets in skimmer after every backwash.  Initial dose of 2 tablets per 50m3 (11,000 gallons) and subsequent doses of 1 tablet per 50m3 (11,000 gallons) after every backwash.