New hot tub was just delivered on Saturday. After a GREAT summer using the TFP method on my pool (after 5 frustrating years of not knowing about this site), I am certainly planning on using BBB on the hot tub as well. My question is, the hot tub installer said that he has seen too many people report heater failure after using Muriatic Acid instead of dry acid for lowering pH. While I find this hard to believe, I don't want to take any chances either. I can certainly understand how too much MA can damage components, and that a hot tub will require very small doses, so perhaps some people have overdosed their hot tub on MA, but are there any thoughts or personal experience from anyone before I give it a try? Thanks!