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CO2 level

Hi all,
I have a question , how do you messure the CO2 level in a tank then you filter through peat ? 
All tabels I have seen say that they can't be used then you filter through peat.

Regards / Hans Sandén
Hans Sandén
Rynnings väg 24
S-360 42 Braĺs

E-Mail hans.sanden at vaxjo_mail.telia.com
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