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I mixed up a batch of 4dKH solution Saturday. Ended up with 500ml and using API's KH test it comes out at 4 using the 5ml sample and close with a 20ml sample (17 drops).
I filled both DC's and put them in the tank and within an hour both were yellow. This morning after the CO2 had been off for 10 hours it's still yellow. For the indicator I used whatever it is that's in API's pH test kit. 2 drops and it was a deep blue.
Sounds like I'm missing something obvious.
SteveU
I filled both DC's and put them in the tank and within an hour both were yellow. This morning after the CO2 had been off for 10 hours it's still yellow. For the indicator I used whatever it is that's in API's pH test kit. 2 drops and it was a deep blue.
Sounds like I'm missing something obvious.
SteveU