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Forgot to add that sometimes maintaining too low or too high a pressure from the regulator may also cause this.
Try setting the regulator between 15 and 25 psi.
Also to reduce wear on the solenoid and controller try adjustig your bubblerate so the solenoid do not need to open and close constantly. Set the bubblerate so the PH in the reactor is constant without the controller or at least so the PH drops very very slowly so the solenoid only have to switch every hour or two.
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Did I write what I wrote? What the heck am I talking about! Well..... Nevermind.
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