Cause: Inadequate filtration/dirty filter
Solution: Check to make sure the filter is running properly/Clean filter with a filter cleaner or de-greaser.
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Cause: Excessive oils/organic matter
Solution: Shock the hot tub water with a chlorine or bromine sanitizer/shock or other shock treatment product.
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Cause: Improper sanitation/bacteria
Solution: Increase sanitizer level to balance hot tub water and shock if needed.
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Cause: High pH and/or high alkalinity Solution: Adjust pH; add appropriate sodium bisulfate product. Cause: Suspended particles/organic matter
Solution: Use Clarifier (If using an ozone generator, do not use polymer based clarifiers)
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Cause: High total dissolved solids (TDS)
Solution: Depending on the severity-drain the spa to half and refill; or drain the spa completely