pH swing in Calcium Reactor

[Trailermann]

I am getting three wide pH swings daily inside my calcium reactor. The largest (e.g. 6.5 to 5.7) happens soon after midnight. My Apex controls the CarbonDoser (CO2 input) and is set between 6.43 and 6.39. The effluent flow remains steady with the Kamoer pump. Why is the solution not rock solid steady?

 

[Randy Holmes-Farley Verified Community Expert]

Same exact time every day? Do you have a graph? It might be measurement error from electrical interference.

 

[Trailermann]

Same exact time every day? Do you have a graph? It might be measurement error from electrical interference.

Peak and valley around midnight consistently. Let me add that we are asleep at that time.