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Old 11-17-2012, 07:49 AM   #13
Richardblack
Algae Grower
 
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Quote:
Originally Posted by Darkblade48 View Post
The best way to check CO2 levels is to use a drop checker with a 4 dkH reference solution.
I use JBL DC, it stays the same green regardless of how much co2 I use
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