Betterbilt Chemicals Kleen-Out Sulfuric Acid Drain Opener, 32 fl oz (Pack of 2)

POWERFUL!!! Do not mess around with this stuff. You can get seriously hurt.I had 2 clogged shower drains in use by over 20 men daily. Ten seconds of running water would flood the entire dorm. Cleaning out the catch by hand before use is recommended. After that, fizz fizz and like magic ...no more clogs. 5/5

We had a bad clog and we were going to have a plumber come out to clear the main line downstairs. We used this cleaner and within 30 minutes the bad clog cleared and water was running like it was a new drain.

Works great

Works like a charm. Wear your safety glasses and have a respiratory device. Stuff stinks.

They didn’t work for me and I let it sit longer so it would work. I used both bottles in 4 consecutive attempts with no positive results. Maybe I should have let it sit over night but the instructions never suggest that option.

First try destroyed the clog like a beast

Like it. Bathtub stopped up, it's the strongest I seen yet.

Cleared up drain fast