Ascorbic acid is safe to use in pools and spas for removing some staining. Ascorb-X is recommended for cleaning projects around the pool and on the edges of the pool.
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Use 1 lb per 10,000 gallons of pool water.
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It is an environmentally friendly product, safe to use and non-toxic around people and pets.
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Not to be used for lowering pH in pools as it causes cloudy water.