Is Water Flowing Slowly? Clean Out Your Own Ventilation Pipes
If you have slow-flowing toilets and drains, the problem may be your drain ventilation pipes, and you could possibly fix the problems on your own. These are the pipes that stick out of the top of your home, and they get clogged with leaves, acorns and other debris.
The air pushes through the tubes and pulls the water through your plumbing system into the waste pipes or septic tank. If air can't pass through, this can cause slow drains.