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If you are running your water below a pH of 7 then you really need to calibrate with at least 2 solutions >>> 7 and 4. That way the controller can establish a slope. If you experience unstable readings while calibrating to a solution the salt bridge is probably shot. Also, if you use a grounding probe in your tank the controller will never be accurate, especially if the pH probe is in close proximity to the grounding probe.
