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Hi
I'd like to ask if its an golden rule to first calibrate at 4.01ph and then 7.01?
My profilux ask for 4ph water first when i calibrate my electrode. But i read somewhere that if calibrating with 4+7water always do 7 then 4. If calibrating with 7+10 water do 7 then 10.
Reason I ask, my tank...
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