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Copper may erode from the spa's circulation system and/or dissolve into the water due to high velocity and/or low pH, low total alkalinity and low calcium hardness. This can show up as green or greenish-blue water. The source of your water may also contain metals such as copper, iron or manganese.
To prevent these from depositing out on the spa's surface and causing ugly stains, use Spa Essentials Spa Scale Inhibitor. Draining the spa may be necessary in severe cases of dissolved metal.
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