Wow! That is expensive, I was looking at http://www.hannainstruments.co.uk/ph/pocket-phep4-water-resistant-ph-tester.html
Our tap water is less than 10ppm caco3
Our tap water is less than 10ppm caco3
No sorry not got a pH pen, as to get a proper one is too much for any benefit I would get, as I currently get green/yellow drop checker all over my tank. I was aware, from reading instructions, that in low KH/GH regions, pH pens are not accurate.Could you reccomend a decent PH pen?
You need to aim for green drop checker, when positioned anywhere in the tank, at lights on. I turn my CO2 on 2 hours before lights on.Thanks Ian. How do you factor in the delay with the drop checker? Do you just aim for green 1 after lights on or something?
It is like Xim says, it is because of the CO2 ~ HCO3- equilibrium. If you have any dKH, at 400ppm atmospheric CO2, the waters pH will be ~pH8, because of HCO3- ions in equilibrium with dissolved CO2.I don't understand why the tank water sample that has been left out has such a high PH