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Got the DS 40. Not available everywhere. It's been in a week. Now everything seems to be working fine. Turns the water an interesting colour. Seems to have dissolved the black bits and black sludge. Hope it has not thinned the pipes. I have flushed and flushed. Neutralised. Flushed and...

I have just got my Magnaclean. Looks like just the ticket. Think I can cut the pipe next to the wall with a jigsaw to install. Then I will run the DS 40 solution round the closed loop with the boiler. I will close off the other rads so the solution runs around the H/E's and the first rad...

Thanks. I get confused. Acetic acid de-scales (dissolves lime). Citric acid will work on the magnetite. Is that right? Guess I can get a bag of crystals from the Plumb Merchant?

OK, I have ordered a Magnaclean. Think I should have fitted one years ago. I have put a bottle of X400 cleaner in the system. Is there a way I can make it work harder on the heat exchangers?

Yep, I need to follow those instructions. The 'water to water heat exchanger' is not accessible in the way I had thought. Thanks for all the replies. :? Tony's note leaves me feeling uneasy. I am of the mind to replace the 'water to water heat exchanger' because that is what fixed...

I need to replace the 'water to water heat exchanger' on a Worcester Highflow 400. To do this, I am going to remove the 'Pressure relief discharge pipe' and cut the discharge pipe (which leads outside) just below the funnel. This is because the funnel is riveted to the 'support bracket' which...