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redstrat · 12-13-2006, 10:21 AM

how the Distilled water with an adjusted KH works is this,
in the drop checker the solution will match the dissolved CO2 of the aquarium regardless of KH in either solution. Knowing this, we add an indicator such as Bromethyl blue(not sure about the spelling) that will show certain colors at a known PH. Using this we can adjust the PH of the indicator solution in the drop checker to change the color to green at the desired concentration of CO2 by manipulating the KH. for example a KH of 4 in the distilled water bromethyl blue solution will be green when the CO2 is at 30ppm, regardless the water chemestry in the aquarium. the whole point of this is to narrow the margin of error in our CO2 measurements.

Correct me if I'm wrong but by adjusting the KH in the solution what CO2 concentration will show green in the following using bromethyl blue indicator and distilled water and the KH adjusted using Baking Soda:
KH3 Green = 20ppm CO2?
KH4 Green = 30ppm CO2
KH5 Green = 40ppm CO2?

These are all +/- 5ppm, correct?

I'm not sure about exact numbers here but i know qualitativly this should be correct I hope it helps clear some things up.

12-13-2006, 10:21 AM	#137 (permalink)
redstrat Senior Member Join Date: Apr 2006 Location: Columbus, OH Posts: 1,082 iTrader Ratings: 39 iTrader Positive Rating: 100% Plant Points: 50195	how the Distilled water with an adjusted KH works is this, in the drop checker the solution will match the dissolved CO2 of the aquarium regardless of KH in either solution. Knowing this, we add an indicator such as Bromethyl blue(not sure about the spelling) that will show certain colors at a known PH. Using this we can adjust the PH of the indicator solution in the drop checker to change the color to green at the desired concentration of CO2 by manipulating the KH. for example a KH of 4 in the distilled water bromethyl blue solution will be green when the CO2 is at 30ppm, regardless the water chemestry in the aquarium. the whole point of this is to narrow the margin of error in our CO2 measurements. Correct me if I'm wrong but by adjusting the KH in the solution what CO2 concentration will show green in the following using bromethyl blue indicator and distilled water and the KH adjusted using Baking Soda: KH3 Green = 20ppm CO2? KH4 Green = 30ppm CO2 KH5 Green = 40ppm CO2? These are all +/- 5ppm, correct? I'm not sure about exact numbers here but i know qualitativly this should be correct I hope it helps clear some things up.