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CO2 test kit



Hi. I have seen a CO2 test kit in a plant specific lab kit (iron, nitrate
and CO2) it was sold at both Petco and Petsmart. I wouldn't bother, you
can
measure your CO2 indirectly by measuring your KH and pH and using CO2
tables.  I've seen numerous versions of these tables, for starters there
is one on the Krib.
--Laurel