I purchased Liquid-Plumr Foaming Pipe Snake Clog Remover for my mother. She had a clogged shower drain and this was the first product I saw in the store. I followed the directions and poured a little less than half of the bottle down the drain. Since it was a very clogged drain most of the liquid was visible in the tub. I waited for 30 minutes for the liquid to work it's way through the clog. I came to see that the liquid was still in the tub. I decided to give it an hour and come back to check on it. An hour later and the liquid had went down the drain. I ran some water in the shower to see if the clog had been eradicated. After running water for a couple of seconds the liquid came right back through the drain. I left the drain alone for 24 hours. The following day I poured the rest of the solution into the tub and left it alone for the entire day. I came back to the tub about 12 hours later to see if the solution had made progress. Nothing had changed and the liquid was still sitting in the tub. I wouldn't recommend Liquid-Plumr Foaming Pipe Snake Clog Remover.