When HTH is added to pool, the powder turns black before it reaches the bottom of the pool. Permanent staining is minimal, but something is out of whack...25 year old pool and never had this happen before. Why?
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When HTH is added to pool, the powder turns black before it reaches the bottom of the pool. Permanent staining is minimal, but something is out of whack...25 year old pool and never had this happen before. Why?