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House hard to heat?
Suffer from Mould, Mildew or bad condensation?
Suffer from Rust, Corrosion?
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Water treatment
rad pin hole
What water treatment should be carried out with a boiler change ?

It is often found that existing heating systems contain a black sludge (magnetite), formed as a result of electrolytic corrosion.
Simple plain water flushing will not remove all of this sludge (which is very adherent and clings to internal surfaces of radiators, pipework, pump, valves and boilers).
One of the ways of dealing with this problem, therefore, is to use a proprietary system cleaning chemical.

Ideally, this treatment should be carried out some time before the boiler changeover. The treatment causes the sludge to break down and become suspended, thus when the system water is drained away, to carry out the changeover, the black sludge deposits are also removed.

After the new boiler has been fitted and the entire system thoroughly flushed several times to remove fluxes, copper and solder deposits, a suitable 'inhibitor' should be added to the system to prevent further corrosion from occurring.
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