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Thanks for the comments. I use bromine (Leisure Time) for the spa. The popular shock products with favorable ratings on Amazon for example are: Oxy-Spa Non-chlorine Hot Tub & Pool MPS [/*:m:ggzxtzj2] Shock Leisure Time RENU2 Renew Non-Chlorine Shock[/*:m:ggzxtzj2] Oxy-Spa has a better per/use...

I plan to be gone for up to a month at a time from my house which has a Cal Spa Bel Air spa. A friend (who has a spa too) told me that his method in a similar situation is to shock the spa prior to leaving; turn off the spa; shock the spa on his return one month later. It seems to work for him...