Unclog your drains with Drano's liquid clog remover which works instantly on coming in contact with the drainage pipes. It contains no phosphorus, so Drano's clog remover will not harm our rivers. And it causes no problems for any kind of pipe of the garbage disposal system and can be used overnight as well. Within 15-30 minutes of application, clogged drains are visibly clearer and A final blast of hot water flushes away what's left of your drainage problem. It comes with a special ingredient in its product that eliminates chances of corrosion of pipes.