The Planted Tank Forum - View Single Post - Affordable CO2 sensor?
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post #60 of (permalink) Old 11-26-2012, 05:40 AM
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Join Date: Dec 2005
Location: Sacramento, CA
Posts: 19,673
Here are some silicone membranes:
Tyvek, which is gas permeable -

Both of these should greatly improve the response time.

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