white gunk

Before undertaking the tiling in the main bathroom I thought I'd try to get some practice by retiling around the sink in the downstairs wc. Having removed the tiles I'm unsure of what layers I've removed (in addition to grout) and how to prepare the walls for retiling. It seems like the tiles...

hi there, i am new to this forum and can someone please help me with an issue i am facing with my CH system? basically, i cleaned the system with X800 and left it in for a week after we had our radiators replaced with new ones about 2 months ago. i then refilled and drained the system three...