Hi, i have just installed me new bathroom, got around to connecting the toilet pipe water, hot and cold, sorted out a leak from the bottom of the toilet, it was an iffy washer, anyway, i connected it all up and pulled the flush, waited and pulled the flush again, i check the back of the toilet for leak, it was fine, i was busy in the bathroom after that and then heard gurgling, it sounded like it was in the outer drain pipe, then i head a gurgle through the bath plug, which is a gully type, i went down stairs and could smell like a sulphur smell in the kitchen, and on the way back up thought i'd pull the downstairs toilet flush, then quickly run upstairs and pull the new flush, and this time water come out the back of the upstairs toilet, so i have removed it, is this normal, all the work is new fitting, i have an outside vent, on top the stack which is brand new, anybody give me some advice how to solve this problem please. or is this normal?.
