MAV AquaDoc ADLS16 Spa & Hot Tub Leak Sealer, Liquid, Fixes Leaks in Spas & Hot Tubs, Prevents Corrosion, Extends Spa Life

It actually does what it says it does, I had a leak that I just couldn’t find in my hot tub so I said I’ll try this thing, I had to do it twice but actually did the job effortlessly, I only used 1.5 ounces each time and I have a 5 person hot tub so I have loads left. But definitely something to have on hand if ever needed.

It actually worked. It took much much longer to fully seal the leak then the instructions noted but it did work. I originally followed the instructions on the bottle exactly as they were written. That didn't work. Then I followed the YouTube reviews which were " dump the whole bottle in near the leak, turn off the heat but let the plum run for 8 hours and then shut the pump off for 8 hours" now I can't tell you exactly what part of this worked but it slowed the leak dramatically and I was content with that. The leak was from a faulty gasket inside the pump motor. I figured if I had to top it off every couple weeks that's good enough to get through winter. But to my surprise today I went out there to check on it and everything was dry. I did drain the hot tub completely refill it with fresh water three days ago, put the filter back in and just hoped for the best. So far... It worker

Have a 600 gallon fiberglass hot tub. Leak was most likely in one or both return lines to the pump. Made several attempts to fix the leak with negative results. Leak was not changed. was hoping for it to work but no such luck. Cant say it is a waste of money for everyone as it apparently has worked for some. Not for me so i wasted my money

Advised to use by a Hot Tub Electrician. No Result after 3 Doses, so basically did not solve the Leak.

Pull the filters, dump in the entire bottle and let it go 24 hours. Was losing 10+ gallons a day and it's completely stopped the leak and haven't lost a drop since. Is it a permanent solution? Probably not...but time will tell that tale (will update in due time) Update: Just shy of 3 weeks since treatment I have developed a small leak again. Treated with a second bottle and will continue to update the results. Also to note, you'll probably want to be sure to have a replacement set of filters on hand as shortly after reinstalling them they were plugged up. I will wait 48 hours this time before putting them back in.