Just had my Bullfrog A8 with Ozone delivered yesterday. After getting the ph and alkalinity right, they put in the SpaGuard oxidizer shock and then Aquafinesse and said to repeat once a week, and that's all I need for sanitation and nothing else to add. I texted my dealer and asked if I needed to pick a bromine or chlorine intra-week protocol in addition to once-a-week shock, and he said "No. Your shock is your sanitizer." Does this sound good enough? New hottub owner and the mega-data and conflicting expert opinions on chemicals are making it difficult to decide on anything with confidence. The guys mentioned and I've read some literature that reports using Aquafinesse reduces the amount of chemicals needed and that is makes the SpaGuard shock last longer, so maybe the once a week shock is enough? Then I read other dealers recommending chlorine after each use in addition to shocking and Aquafinesse and a see a youtube video of a NY dealer using the SpaFrog placed in the filter area.