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I don't agree with the product or most of the stuff on their site. There are others that work just as good or better IMO. But I don't think they are needed as much as they would make you believe as long as you maintain and drain your water properly.But hang on a couple minutes I will get blasted for not believing in the "science"
Would someone that has a jar of this stuff please take a perfectly clean glass jar say one gallon. Put a gallon of water from your hot tub in it and add the proportional amount of Ahh, and shake it up. There should be no biofilm in a glass gar that just came out of the dish washer so if it forms gunk the gunk is coming from the combination of spa water and the Ahh. Another test would be use hot tap water and some chlorine or if you wanted to be super scientific try distilled water and chlorine. I don’t have any Ahh or I would give it a go and I don’t feel like buying any.