When flushed the toilet bowl is filling up to the rim and draining very slowly, we assumed it was clogged but have removed the toilet and there is definitely nothing blocking it, likewise the waste pipe did not appear clogged, when a power hose is run down the drain pipe it flows continually but when the toilet is re connected it fills up and drains slowly again. . . . Could it be something to do with the connection between the 2 not creating a vacuum or something?