Unfortunately these tended to cloud up the water in the hot tub. I wouldn't recommend it for that purpose. May be useful in jetted bathtub where you change water with each use but not in a hot tub.
Thank you for the great review, We always love to hear this feedback, I'm sorry that it made the hot tub water cloudy when using these. Here is a code for you to use next time you shop with us: 5%OFFRETURN