Hello

So, what's the last word (if there's any) about the nature of that white
slime that tends to collect in Nutrafin diffuser at the point where CO2
bubbles enter the diffuser? Quick search on Google reveals that many people
believe that this is some product of the brewing process, which travels
trough the tubing from the bottle to the tank. However, somehow I find it
hard to believe that any substance heavier than gas could travel such long
distance in upward direction. Moreover, how come I don't see any traces of
this stuff in the check valve? Does it need to be in contact with water to
become visible?

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Best regards,
Andrey Tarasevich