The Planted Tank Forum - View Single Post - Affordable CO2 sensor?
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post #45 of (permalink) Old 11-18-2012, 02:45 AM Thread Starter
No more Bow ties
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The reading in the 10G low tech tank kept rising to 2700+ppm! Somethings wrong.
I deduced that the membrane is facing the outflow of the filter. I suppose CO2 kept going through but can get out through normal diffusion.

So I placed the membrane face down. PPMs are falling. Interesting. This will help in the design.

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