Norman Billingham wrote:

Most large builder's merchants or plumbing suppliers will sell you the stuff
for cleaning a heating system and it comes with full instructions. When
you've read them you may change your mind. The stuff is a weak acid. You
put it in the system and run the heating flat out for about 24 hrs, then
have tio flush it clean for ages. The acid will seek out every weakness so
if you radiators really are rusty there is a fair chance they will start to
leak, so be prepared to do some work,

Once the system is cleaned it needs Fernox in it to inhibit further
corrosion.



Different flushing agents stay in the system for different times, e.g.
the Fernox stuff that I am about to add specifies 1 week, whereas the
previous lot (from B+Q) specified 2 weeks.

Richard

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Real email address is RJS at BIGFOOT dot COM