I just used this product for the first time to unclog my kitchen sink drain. This product is phenomenal!! Having used Draino and Liquid Plumr in the past and not having much luck, I was a little skeptical. Once I poured it in the drain it took about 45 minutes to completely unclog a nasty, greasy kitchen drain. I would highly recommend this product!!!! If you are stuck with a badly clogged drain, this is your product. Give it a try.