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Our new tub arrived, a Bullfrog A5L. Previous tub was a used 2001 Hot Springs Jetsetter, with which I learned TFP chlorine technique and eventually added a Controlomatic inline SWG. It's been a couple years of warm water deprivation, so glad to have a new tub! The upgrade in technology and...

Well this is great! Thanks to the advice I have read here, I just finished adding borates to my spa. Pool Calculator came up with 12 oz by volume of Borax and 6 oz of muriatic acid. Not having dealt with full-strength MA before, I took precautions: chemical resistant gloves, safety glasses, a...