Temporarily prevent a full toilet bowl from draining

draintoilet

I want to fill the toilet bowl with water as high as I can and let the water sit without draining for up to 24 hours. Why? To let some (gentle) cleansers do their work. I've tried shutting off the water at the wall and refilling the bowl from a pitcher, but inevitably the water starts draining too soon. Ideas?

Best Answer

The toilet bowl can only hold water as high as the top of the porcelain inside of chamber 5 in the picture below, unless you do something to stop it:

Toilet cutaway