Funnel shape of a toilet bowl – Modern toilet bowls, both hanging and standing, including compact, have an internal so-called. funnel shape. The inner part of the toilet bowl does not have a shelf, as in the old types, but it just tapers downwards with a funnel. Thanks to the funnel shape, the amount of water needed to completely rinse off impurities is reduced. All you need to do is rinse off larger dirt 9 the 6 1 water, the small ones can be rinsed off already 3 l of water.