Have been using a great product, Plumb-Away, to open all the drains around my home. It doesn't matter what type of drain--even toilets. Literally the drain is opened in about 1 second. The best part is the not only is it environmentally friendly (no harsh chemicals, or poisons), but works better and is cheaper to use. And, one can will open 8 or more drains. I found it at Amazon.com, QVC.com, and other regular type stores like Home Depot.
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