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Toilets typically connect to your main vent stack, a vertical pipe that runs through all finished levels of your home and exits through the roof. It’s located behind the walls, but if you have an unfinished basement or a utility closet, you may find a portion of it running the vertical length of the space. Some basement toilets use an air admittance valve instead, which is a small vent located in the wall directly behind the toilet that extends upward a few feet from the drain.

While you shouldn’t increase the flow of your low-flow toilet by adjusting the water level in the toilet bowl set by the manufacturer, you can make the flow as efficient as possible by ensuring the rim jets under the rim are unobstructed. To do this, use a mirror to look under the rim and scrub them with a toothbrush or a small wire to clear any debris stuck in the holes. You can also watch for leaks, make sure the internal components are in good shape, and replace them if necessary.

Your toilet handle might not come back up if the nut is loose or the bolt threads are stripped. Try to tighten the mounting nut and wrap plumber’s tape around the handle bolt to fix stripped threads. It’s possible the handle was improperly installed. If that’s the case, you can use the instructions above to correct the handle’s position. 

According to the Uniform Plumbing Code (UPC), the distance between your trap and the vent should be no more than 6 feet. For your vent to work properly, it needs to feed into the drain line within 6 feet of trapways that connect to it. Using this formula, you should be able to determine whether you will need multiple vent lines.