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I purchased a used Reef Fanatics pH controller for a very low price off a local hobbyist recently, hoping I would be able to put it to use on my nano as a way to prevent accidental kalk overdoses. My issue is this pH controller was designed for calcium reactor use and therefore only has calibration points at 4.0 and 7.0 pH and does not have the ability to calibrate it at 10.0, which is more in line with the range I need. I have two questions:
1) Will it really make a huge difference to the accuracy in the 7.8 - 8.2 range if it does not have a calibration point at 10.0?
2) If so, could I potentially use a 7.0 calibration solution for the 4.0 point and a 10.0 solution for the 7.0 point and simply take any reading and subtract 3? I know pH is logarithmic and not linear so I have no idea if this is a good idea or not.
Appreciate any input.
1) Will it really make a huge difference to the accuracy in the 7.8 - 8.2 range if it does not have a calibration point at 10.0?
2) If so, could I potentially use a 7.0 calibration solution for the 4.0 point and a 10.0 solution for the 7.0 point and simply take any reading and subtract 3? I know pH is logarithmic and not linear so I have no idea if this is a good idea or not.
Appreciate any input.