Here is some information on drain cleaning and the use of coffee grounds. From advise of a friend I disagree with the description of the use of a plunger. The article is correct as to seal the overflow holes and to put water in the sink that covers the plunger. Where I disagree is that they say to vigorously work the plunger. Since most clogs are packed in the trap or pipe pushing helps to pack the clog. I will slowly push the plunger down and quickly pull it back hoping to pull the clog out. My favorite tool for this is my shop vac. It pulls out the clog and neatly deposits it inside vac. http://www.consumerreports.org/cro/home-garden/cleaning-supplies/drain-cleaners/overview/1106_drain_ov_1.htm
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