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Originally Posted by hoppycalif  Now that price is low enough to give this serious consideration, but no color standard card is included. The only way I see to use this is to independently determine that you have adequate CO2, and try to keep whatever color that gave as the right color. It does look pretty good though. |
Just use Bromothymol blue and use the 3 images above. Exact CO2 levels aren't important. Getting addiquate CO2 is.