Zep Sulfuric Acid Drain Opener - 32 Ounce (Case of 12) ZUSADO32 - Professional Strength Drain Cleaner

This stuff is powerful & works really well. I have been using this for years & I highly recommend it.

Tried plenty other drain openers with no results. Poured ZAP in and next morning drain was unclogged. I did not pour it in the sink since it ruined it once before and I had to replace. This time, I undid the pluming underneath the sink and poured it there and worked like a charm.

Extra stong be careful

Stuff works great if nothing else works. Only buy last resort if other drain cleaners don't work because this drain cleaner is strong. Make sure you rinse out drain atleast 5 minutes or more to prevent chemical eating through you pipes. Must wear heavy duty latex rubber gloves and safety glasses for safety.

Well, when I got this stuff, I just went ahead and opened it up and poured it down the drain, and it got rid of the clog that had been there for some time.

The packaging was very disappointing and probably very dangerous for the people transporting it from A to B. Almost all of the bottles were leaking to the point the inner cardboard had been saturated. This is a very powerful drain cleaner product, and the seller should have taken more steps to ensure that being banged around in transport didn't damage the internal packaging. It does work well as a drain cleaner, though.

This clears drains great, but there is a reason this is a 'professional' product. This is highly caustic and will react with metal, etc and etch it. It can also boil water in the pipes and forcefully eject acidic water from the drain. Be careful.

Great for cleaning drain lines. It removes anything organic.