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Why does the manual (Caldera) say "DON’T use household bleach (liquid sodium hypochlorite)." and what am I supposed to use in the 3 Step Bromine from the Bromine For Beginners which says that I need to use household bleach to shock the system to get it going. I believe one alternative is to use a non-chlorine shock, but I'd like to understand why I'm not supposed to use household unscented bleach like the Bromine For Beginners thread says. What other Chlorine Shock options do I have? I don't mind spending a little bit more if there is a decent reason, but I'd like to understand what's going on. I am buying a used Caldera tub with the Spa Frog System in-line. It seems to have been maintained well but I am going to do a thorough Nitro Decontamination anyway and I want to make sure that on my first REAL fill after the Decontamination that I do the best job I can with the 3 Step Bromine Method while still attempting to follow the manufacturer's "rules" assuming they are legit. Maybe I'll stick with a non-Chlorine based shock, but I like learning instead of following blindly. I have started learning and I'm already making a whole shopping list of things to buy, first and foremost is the Taylor K-2106, Second Filter, SeaKlear Spa System Flush, Hose Prefilter (semi-rural water system, so better than a well, but probably more metals and calcium than the city.), maybe a digital meter as a sanity check on the Taylor or as a "quick check" but I need to do more reading to see if any of them are really accurate enough. I'm also buying the Spa Frog cartridges for the minerals and the bromine dispenser, but I really like the idea of adding the initial fill bromine required to set the level without the cartridge and maybe make the cartridge last a little longer, and the shortlist of other chems I'll need to manage the water qualities as per the Bromine for Beginners thread. I think everything is making sense except that pesky Don't use household bleach versus use household unscented bleach conflict. Disclaimer: I did a silly thing. I attempted to do a search for Caldera Bleach, Household Bleach, and other variations and I either found nothing or I looked through the staggering results and didn't see anything that addressed my Hot Tub Manual telling me no. So, please forgive me if I missed something. I tried. Really. (I even enlisted Google.) Thanks!