Quote Originally Posted by happyjack View Post
what do you have to do to use bbb in spas
You can read the following about the Dichlor-then-bleach method:
http://www.poolspaforum.com/forum/in...howtopic=13634
Dichlor/bleach Method in a Nutshell
Chlorine Demand
Decontamination Procedure

If you want to use bromine instead, then read the following (the links on oxidizer demand and decontamination above still apply):
waterbear's Post on 3-step Bromine Method