Water, is it an issue?
I agree with Robert, Britta will likelt solve the chem question.
Second on the Pesach issue: can't you "sell" your starter to one of your non-Jewish friends and then "buy" it back? You could dry out a thin layer of your starter on plastic wrap then after it is thoroughly dry, wrap it up in plastic and freeze it ( a method of freeze-drying) and rent it out to the sane friend above
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