It’s tempting to dump household wastes down the drain. Sure, it would be so easy to just pour that used motor oil down the sink. But, in the end, the convenience will cost you. Discarding some types of waste in your toilets, garbage disposal and sinks can damage your plumbing system. And fixing that damage gets expensive very quickly. Don’t believe us? Flush things that aren’t meant to be flushed and you could have a backup or overflow on your hands. Washing items or liquids down a sink can have similar consequences in the form of slow, clogged drains.