Cloudy water could be caused by a number of factors, namely:
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Inadequate filtration/dirty filter – Increase filtration Cycle duration if used heavily. Clean or replace filter as necessary
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Excessive oils/organic matter: use Shock spa with Sanitiser
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Suspended particles Run jets and clean Filter; Use a Clarifier
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High total dissolved solids (TDS) Depending on severity, drain spa to half full and refill or completely drain and refill.