This did the trick for me!
Trying to keep the sinks at laboratory stations clean and unclogged is a never ending nightmare. My students hear me say "Please throw your solid waste in the garbage and not in the sink" on every single lab day. For the most part, my students are conscientious and do a great job in cleaning their work area at the end of the lab. But there are always those who get in a hurry or get distracted and dump items in the sinks that belong in the trash. Microscope cover slips are the worst! Students rinse their slide, but forget about the cover slip. Invariably, a collection of cover slips covers the drain, preventing water from draining.
The solution to this age old problem is simple and relatively inexpensive. This (seen in the picture above) is a roll of rubberized sink liner that I found at a store that sells restaurant supplies. A friend told me about it.
I simply cut strips of this material to fit each and every sink in my lab. Water can still pass down the drain, but all solid materials are "caught" by the sink liner. At the end of the day, I lift the liner and shake the debris into the garbage can. It works like a charm.
I just wish I had thought of this many years ago!!