precip and pH in mulitple chamber CaRx

[spieszak]

So, as thought experiment mostly.... though, depending on the answer, I suppose it could apply to a real world scenario..
If you were to continue to add chambers to a CaRx with the goal of raising the pH of the effluent (because of a tank that consistently runs a low pH), is there a "reasonable" pH at which you would lose solubility and turn your effluent into precipitate? (reasonable meaning not only hobbyist obtainable, but also within a valid range for tank purposes)

 

[Randy Holmes-Farley]

Depends on the alkalinity and other factors, but low to mid 7’s is the ballpark for precipitation over dissolution, but the kinetics (speed) of either reaction may be very slow near the saturation point.