Get rid of foamy hot tub problems by rinsing off bathing suits and avoiding shampoos, lotions and other products before going into the hot tub.
Change the filter every year, clean the filter every week or two and soak the filter every 3 months in an overnight filter cleaner. Use a defoaming liquid to temporarily lower the foam until you can change the water. Change water every 3 months or so depending on use.
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Typically showering before and after the hot tub is the best idea.