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I have a filling loop and a pressure gauge and need to drain the system as the water is black. When i refill, do i add any water treatment/protector and how do i do this ? Thanks for any help. :D :D

I have just moved house and all the radiators and valves need changing (Leaking) also some slight alterations to the pipe work, as i can not find radiators the same size that are already fitted. A new boiler was fitted with a filling loop and a pressure gauge but the previous owners never...