Quote:
Originally posted by EMC2
Jim - with that small of a volume of loss, I would place bets that most of it is simply your tubing 
Most silicon materials can be considered as porous (it isn't really porosity per say, but permeability). This is why 'common' silicon tubing gets discolored from additives. It is also one of the big reasons that we don't use silicon products at work for sealing electronics from moisture and contaminants (along with issues of out-gassing).
Silicon materials are actually also used as permeable membranes because its makeup. It allows diffusion to occur as a result of it's physical structure at the molecular level.
But 1 teaspoon every other week isn't a biggy
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Emc2
I read this elsewhere. I thought this could be part of the problem. I wonder if this is why the stuff smells too?
I am going to go over to Tygon I believe it will be less permeable.
THanks
Jim