I purchased Liquid-Plumr Professional Strength Gel Clog Remover for my kitchen and basement sink. I had a very severe clog so I poured half the bottle into the sink and left it alone for 24 hours. The next day I came back to the sink to see if it had worked its way through the clog. To my surprise the same amount of liquid was still sitting in the sink. I decided to pour boiling water in the sink to see if that would help the liquid drain, but it didn't work. I ended up rodding the pipe out to get rid of the clog. I also tried this product on my basement sink. This sink was semi clogged with lint from the washing machine. I poured the other half of the bottle of liquid down the drain and waited for it to run out. I waited for 8 hours and nothing happened. I ended up getting rid of the slow drain by just using bleach and hot water. I definitely wouldn't recommend Liquid-Plumr Professional Strength Remover to anyone with a drain problem.