On Tue, 04 Nov 2003 09:37:19 +0000, Andy Hall
wrote:

I doubt whether there would be any reaction between different brands
of chemical, but personally I would flush the lot and start again,
simply to have a known situation.

I have the same thoughts on this.

I know there is a recommended minimum level of inhibitor for a CH
system, but is it feasible that there might be a maximum level? So if
you've got inhibitor in there already and don't flush it out the
system could overdose on inhibitor?

Might sound implausible I suppose, but I expect heat transfer
constants in water and in inhibitor to be different, so if you get the
mix wrong.....

PoP