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CO2 & PH Controllers
Jim Miller wrote:
I guess I haven't figured out how the controller makes anything safer. If the probe goes out of calibration it could cause the controller to call for more CO2. The cure for CO2 end-of-tank dumps is a needle valve working against a pressure head. To be clear, I'm in the "run CO2 24 hours/day and your pH swing will only be 0.2" camp. However, about 3 weeks ago my dual gage regulator-needle valve system ran out of gas. It did an end of tank dump. pH dropped from about 6.4 to a bit under 6 before I noticed fish behavior and turned it off. So a needle valve does not prevent an empty tank pressure dump. Interestingly, without any injection, pH only rose 0.2-0.3 per day.Cutting surface agitation REALLY helps. |
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