These days low-flow toilets and faucets save a lot of water, but drains don't fare as well because of it. Since such small amounts of water are flowing through the drains on a daily basis, a lot of debris stays lodged inside the drains. Over time it can build up and form clogs. To counteract this problem, you should occasionally flush your pipes with large amounts of water. For the toilet, pour a large bucket of water into the bowl as you flush continuously. For bathtubs or sinks with low flow faucets, fill them up with hot water and then release the drain plug.