Please firstly excuse my stupidity if this is a simple matter..... But I wonder if someone could tell me why the flow of the hot water reduces when I turn on the cold tap (they are separate, although the same happens with the kitchen mixer tap)? Might this be due to the configuration of the pipes.... I thought that the sources were different, with the hot needing to go through the (combi) boiler, but the cold not having anything to do with that.... Of course, I know nothing much (at all) about these things :o/
Also, there is some kind of nasty black build up inside of the taps themselves, which I attempt to remove but gradually builds up again. This is 2006-built rented property of rather dubious construction in some aspects, so I suspect that a half-hearted job has been done overall..... The landlord is not any help and I am not a DIY-er where plumbing is concerned. I purchased new taps but he will not fit them and besides, I do wonder if the problem is somewhere in the piping....? The water from the supplier is not contaminated.
I hope someone can help or advise me; I have brushed teeth with bottled water for two years now :o( Best wishes.