Join Date: Oct 2006
Location: Leesburg Virginia
Mine is green in the morning but, almost yellow when CO2 shuts off in the evening. There is a delay in reaction time for the drop checker. Also, the amount of current in the water affects how quickly the CO2 dissipates. I also use a ph test and CO2 chart. Neither is completely accurate, in one the delay is too long and the ph kit isn't accurate because there are other things affecting KH. But together, I get a general idea of what is going on. The drop checker tells me with better accuracy where the CO2 level gets to eventually and the PH test tells me the change over the time period.
This isn't ideal but, the best we can do within reasonable cost.