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Discussion Starter · #1 ·
I used these 10 month old drops to figure out the CO2 concentration and found it to be about 100 ppm...

ph - ~8.0
kh - ~6.7
gh - ~12.4

I was using diy CO2 for a day or two but I took it out a couple days ago because of these readings. Can this reading be correct or is it the drops?
 
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