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Does your spa have a slimy white substance on the surface that looks like tissue paper? Does it look like the is spaghetti floating on it ?
To remove bacteria in a spa, first drain the spa completely. Refill with fresh water up to the jets. Shock the spa with 3-4 times the normal amount of Stabilised Chlorine Granules.
Allow the spa to circulate for 2-3 hours. While running the circulation, remove the filter(s) and soak in a solution of appoximately 2 tsp. of Stabilised Chlorine Granules to 10 gallons of water.
Drain spa again, refill with water, rebalance and sanitize
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