Re: I really need Freezepruf !
following on from JeffreyP's comments about Polyethylene glycol (PEG) above. I'm just doing a bit of checking with German colleagues but it may be the case that certain widely available antifreezes for solar hot water systems and ground source heat pumps are based on PEG. I will come back when I have the info. These would be cheap and fairly widely available in Europe.
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