have to hold the flush down to make it flush but this way you can control the amount of water that goes down.  there are places in the tank that the water doesn't come down the sides and that makes it so not all debris goes down.  cleaning instructions are ridiculous being that you don't know what product to use to clean.  I wish that they would specify a product instead of being so vague.  All that I knew was I couldn't use bleach.