I decided to try a pressurized drain opener by the CLR company as I had read that some folks had found it to be more effective than the liquid drain openers. It is also more environmentally safe as it uses no harsh chemicals in the process. It comes in a 4.5 ounce can and is set for about 15 applications. Its price ranges from 10-14 dollars. I have tried it several times though and I have to say that I have not had really favorable results. I have actually found the various liquid ones to be more effective. Sometimes I have found it a bit tough to get a good tight seal to utilize it. The CLR company is known for making good products and I have found most of them to be pretty effective however I am not too crazy about this one. I have to pass on this one and give it a thumbs down.