Hot Tubs and Phosphate

Almost all hot tub water care programs include some form of scale and stain control.  This protection is important for the protection of heaters and surfaces of a hot tub.  However evidence is accumulating that suggest this very protection can add to the risk of scale formation. The risk starts with scale and stain products that contain polyphosphonates (HEDP).  HEDP is found in a majority of these control liquids.
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