Edwin Pawlowski wrote:

wrote:

you won't get it all out because if you do and there isn't anywhere for
the expansion, then the water will burst the pipes if it gets to cold.

The expansion tank is for warmer water, no?

High oxygen does cause corrosion. In industrial systems, the best way to
get rid of it is to use sulfites as an oxygen scavenger...

Would this remove all the oxygen in the expansion tank? Seems unlikely.
Would pressurizing the expansion tank with nitrogen make it last longer?

Nick