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the reason I said about the water being black is because I read an older post on a similar matter a while ago and I think they meant if the water is black then it is the old dirty(ish) CH water. DOn't know if this makes any sense to you?

yes that is correct, they are usually little plastic things which come with a rad when you buy it. some people forget to use them but they do make a difference, apparantly!

thank you seco for your advice and help. will this also work if the blockage is in the actualy air separator? i guess it should?

Hi-there to return to my post from a few days ago. What cleaner / chemical cleaner can be used to clear the cold feed? Also though will this not just mean that the crud/sediment will then be circulating around my central heating/primary pipework? Does bleeding the top rads and them...

yeah maybe i guess. just thought you meant when using it it'd break!!

why will it break off ? ...!

yeah that's the one, in a case. i should have invested in a better quality one now. mine has the plastic handle!!

oh i have seen the tradesman's tap reseating ket from bes in their catalogue. i take it it is a lot better than my little one! :)

i paid £8.99 for it. It had 3 heads but i don't know if you can you both sides of the heads? on all 3 they have 1 serated edge side and 1 flat side but i'm not sure if the flat side is supposed to be used or not?? ... sorry if i sound ignorant here.

it just gives priority to hot water over heating when both are calling or required at the same time. so not a good idea in a large household in cold weather! that's why the 3 port mid position or 2 x two port valves are more popular than the old 3 port diverter valve that always gave hot water...

yeah i suppose, but as long as the tap reseater fits then i guess it must be fine? or is there a rule of thumb, ie the disc the same or similar size to the tap washer is the best one to use? i haven't any domed shaped discs with mine tool though just flat ones with serated bits on.

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and it saves you needing to an an inhibitor again. i suppose you only need to drain if you want to change pipework... otherwise sounds good to me. When I changed a rad valve using 2 bungs i closed the lockshield drained the rad, bled it as i was doing it, and no water at all came from the...

could be an airlock. one rad being removed cannot suddenly stop all the others from warming - unless an airlock.....

putty or sealant (clear type) under waste outlets (both sides) can help create a better seal or you can use a basin mate as previously said. sometimes the washers (plastic type) with the wastes do leak (especially the cheaper ones) so either buy a basin mate (about £1) or use sealant/putty.

a 3 port diverter valve also gives hot water priority-not the 3 port mid position type.

i know screwfix is good - but b & q aren't that expensive really...!!

haven't used the reseating tool yet as a bit worried now!! how do i know exactly what the correct one is? a few of them actually fit inside the tap body....

maybe your landlord needs bt buy aqnd get fit and new shower/bath mixer? sounds like yours is broken!..

interesting post-I too have hears of this but never tried it yet, sounds a lot easier than draining and refilling! Why would bleeding the rads first help to create the vacuum though? And why is it important to listen out for the gurgling? Is this to let you know water is on the way?! I...