The Planted Tank Forum - View Single Post - Affordable CO2 sensor?
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Old 11-26-2012, 05:40 AM   #60
Hoppy
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Here are some silicone membranes: http://www.sspinc.com/ssp_store/Thin..._to_040_21.htm
Tyvek, which is gas permeable - http://www.amazon.com/E-I-DuPont-Tyv.../dp/B001TO4QVA

Both of these should greatly improve the response time.
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