The Planted Tank Forum - View Single Post - Affordable CO2 sensor?
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post #40 of (permalink) Old 11-14-2012, 01:18 AM
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Join Date: Dec 2005
Location: Sacramento, CA
Posts: 20,304
When I tried one of those breather bags as a membrane for a drop checker I was disappointed in how slow it worked. The breather bag is designed to pass a very small amount of air per minute. If you used a membrane made for an oxygen sensor, which you can get at Perkin-Elmer (?), it should work a lot faster, but the membranes are extremely thin and easy to break. Avoiding small water or air leaks is a very difficult thing. You need a brainstorm session to come up with some kind of breakthrough for that. (And very good manual dexterity)

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