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Looks like your typical ADA knockoff from Hong Kong/Malaysia.

I use something similar and it works fine. Just ignore the instructions that come with the drop checker and don't use aquarium water. Use 4 dkH solution instead.
 

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Probably should get some solution from Sumo.
Just don't know which ppm
http://sumoregulator.com/DropCheckerSolutions.html
30 ppm is what most of us use. This is 4 dKH.

With a KH of 4.0 in the drop checker, you get ~30 ppm of CO2 when the BB indicator solution is green at a pH of 6.6.

A 2 dKH solution is green at ~ 15 ppm of CO2 with a pH of 6.6.

The 6 dKH solution is green with ~ 45 ppm of CO2 and a pH of 6.6.



From: http://www.plantedtank.net/forums/attachment.php?attachmentid=812&stc=1&d=1107560221
 

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1 dkH = 17.9 ppm CaCO3... so buy the 71.6 ppm one?... hahaha
hmmmm... our numbers do not agree with eachother... what is the deal?
:icon_lol: I'm sorry, but I'm chuckling too. :icon_lol:

You are converting dKH to ppm.

You should be calculating CO2 ppm.

The formula used for this calculation is: CO2 (in PPM) = 3 * KH * 10( 7-pH ) where KH is Carbonate Hardness in degrees.

From: http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm
 

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1 dkH = 17.9 ppm CaCO3... so buy the 71.6 ppm one?... hahaha
hmmmm... our numbers do not agree with eachother... what is the deal?
Yes, 1 dkH = 17.9 ppm. Thus, you want to get the 71.6 ppm or the 4 dkH reference solution...

Your numbers do not match up with Left C possibly because you are comparing the wrong thing. Left C is talking about a 2, 4, or 6 dkH reference solution, which will turn green at a pH of 6.6 when the CO2 concentration is either 15, 30 or 45 ppm, respectively.
 
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