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What do you fill a bubble counter with?
I made a DIY bubble counter for my CO2 system, and up to this point have filled
it with DI water. However, I was wondering if there are any other suitable
materials that don't evaporate or add something toxic to the CO2 stream that can
be used as a substitute? I don't have to refill it all that often, about once
every 3 weeks or so, but was wondering if anyone uses anything different as a
substitute? What does Dupla recommend to fill their bubble counter with? I was
thinking of using mineral oil, or something else along those lines. Does anyone
know of any reason I wouldn't want to use mineral oil? What about glycerin? Any
problems with that?