On Sun, 27 Jun 2004 08:29:48 +0100, "dave @ stejonda"
wrote:

In message om, Dave
Liquorice writes
On Sat, 26 Jun 2004 18:05:44 +0100, dave @ stejonda wrote:

This is an excellent idea ISTM and something I'll consider
organising for the next time I need to do this in ~3 years time.

erm, why would you be doing this again in 3 years time? Surely when
you finally refill this time you'll be adding a corrosion inhibiter.
Shouldn't need touching again unless you have problems with the
system.

cue .andy ...

Tee hee.

Not much to add really.

Inhibitors do degrade over time, although I'm not 100% certain what
the mechanism is. When I had an open vented system, I would test at
least annually and after about three years the inhibitor was showing
marginally with the test kit. so 3 years isn't a bad rule of thumb.

I would then drain a little water and top up, but then on every
alternate occasion (i.e. every 6 years) would drain, flush and refill
with fresh inhibitor.

Now with a sealed system it's just coming up to two years and no sign
of degradation. It could be that the degradation mechanism is with it
being open to the atmosphere and some amount of oxygen dissolving but
I am not certain.

..andy

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