Ahh-Some - Hot Tub Cleaner & Purge Packet | Clean Pipes, Jet Line & Jets Gunk Build Up | Clear & Soften Water for Hot Tub, Jetted Tub, Swim Spa | Top Clarifier Up to 450 Liters of Water (4 PCS)

Run this every few months before draining and refilling the spa. Works great. Almost too great. Will gross you out the first time you see it working. Chemicals act real fast and you will start seeing yellow gunk rising almost instantly after getting this stuff in the water. Protip - after using this a few times if you monitor this and baby sit it while it's doing it's work, use one of the hand skimmers to skim off all the nasty yellow foam that gets produced and toss it out continuously as it's produced. It will save you a lot of scrubbing later. If you just run this stuff and leave it alone it will dry on the shell pretty good and takes some effort to scrub it all back off with a towel or sponge.

Excellent product. I have tried many for cleaning my Jacuzzi tub, and this works the best.

This stuff is amazing. I have used MANY other cleaners and while they all seem to do something, the crud and weird material that comes out of the tub when using this stuff is just nuts. Its easy to use but so much stuff came out of the tub it overflows and when the suds disappate you're left with a sticky oily sustance on everything so try not to let it dry and wipe it off while its still wet. All in all, I would not own a tub without this stuff.

Cleans well. Happy with results

This product is great for clearing out biofilm before doing a water change in my hot tub. There’s always a lot of gunk that comes out that I never expect. The main drawback is that you absolutely must keep on top of wiping off the shell around the water line while running the purge and pumping, otherwise the gunk gets hard to remove.