I'm rebuilding the basement in the house. I have a concrete floor with about 6feet 7inches of space from floor to ceiling. I'm adding a bathroom and I have been looking into buying a Saniplus macerating toilet. it says you can attach a sink and shower/tub to it and it will pump the gray water out as well so you don't have to dig up the floor. My question is does the shower still require a p-trap to be installed? The pump has a back flow valve installed in the waste-pipe... I've not got a lot of space to play with to get a proper shower installed and a tub isn't an option as the purpose for the basement being redone is to have a family member move in. They cannot use a tub and they are 6ft tall. Any opinions on these macerating toilets? Or good ideas to install a stand up shower?