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Dupla CO2 indicator vs. CO2 test kits
Could someone please explain the difference between the Dupla CO2
indicator (I think Eheim also has a similar device) and a CO2 test kit?
Does the Dupla indicator actually measure CO2 directly? When it
indicates sufficient CO2, how much CO2 is in the water?
It seems convenient to have a constant indicator like the Dupla, but not
if it doesn't do a good job. I (unfortunately?) purchased the Dupla
indicator before realizing that it might be insufficient.
Also, does anyone know what the color-changing chemical is that you put
into the indicator?
wshimoda at hei_com