I cannot figure out how to fill the toilet so that you can see the water in the see thru tube. I push the electric fill button on the toilet to let clean water in the bowl and nothing comes out. The pump runs but not water comes, i am not sure where the water is supposed to come from? Where do i fill the clean water at? What is that top tube that swings out for? There is water in it and it doesnt go anywhere. Please help, i posted pics below of my system.