hey all new member here but just couldn't help joining the ahh-some party here. I've slain the biofilm monster with this stuff, and even tested a number of other products as well. ahh-some is the only one that is for real.
I also agree with the multiple purges thing. people have a tendency to expect that one purge will work miracles, but if the spa is significantly contaminated -- and biofilms do regenerate quickly and with vengence -- you will need several purges. I've said this before but the spa is not clean until you are running an ahh-some treated spa WITH FILTERS INSTALLED, and you see no material release. you have to purge first without the filters installed -- per label directions -- clean the filters outside the tub with a solution of ahh-some plus your favorite de-greaser. then when you have a squeaky clean spa dosed with ahh-some, put your cleaned filters back where they belong. In my case, I got a little more material released, which I was able to wipe up with a micro fiber cloth while the jets were running. drain the spa and rinse everything,, including the filters, as you would normally do.