strange problem with CO2 set-up - help!

[Steven Robinow]

Dear Emma,
Some tubings are CO2 permeable.  Yours probably is.  What happens is 
that after using CO2, you turn off the system.  The CO2 leaks out of the 
tubing, but air cannot get in  and you get a vaccuum that sucks up the 
water.  One solution is to tip the water bottle when you are finished so 
that the bottom of the tube is exposed to air and not water.  

	-Steve