Mr Fix It Plumbing 4320 Atlantic Ave #230, Long Beach, CA 90807 (562) 988-2454 http://www.mrfixitplumbing.com/ After some time, this debris builds up right into a blockage that either fully or partially obscures the drain, slowing it or stopping solely. Though you might be tempted to test one of those https://www.google.com/maps?cid=4067949459714107514