If your toilet gives you trouble by not flushing properly, you might suspect the problem is low water pressure. But pressure has nothing to do with it. The water in the tank does the job. It fills the bowl and starts the flush-and-siphon action in the P-trap below. Gravity starts a flush and natural siphoning draws it through.

When a toilet doesn’t work right, something is inhibiting water flow. Maybe a line is blocked or water ports under the rim are clogged. Or the tank is not full enough. First, check the tank’s water level. If low, adjust it by raising the float. Then try cleaning the water ports using vinegar and a coat hanger. If that doesn’t do it, call in a sewer and drain specialist to clean up your “water closet” lines.