Question About Co2 Drop Checker
It is my understanding that a Co2 drop checker uses the Ph/Kh realtionship. My drop checker is showing green (it was blue for a while). I haven't done anything different, except lower Kh and Ph. My question is, would this affect the drop checker? Does lower ph/kh mean higher Co2 in all circumstances? If a drop checker only measures the ph and kh, and a lower ph/kh doesn't necessarily mean higher Co2, how can you trust it?