CaRx question?

zip70 · Dec 10, 2020

Hello,
I am running my CaRx with masterflex pump. Somehow my ALK is sitting at 10.5 . But I need to lower to about 9. Pump is set at 48 ml/m. Should I increase the output or decrease to lower Alk? Thanks in advance.

Randy Holmes-Farley · Dec 10, 2020

I would decrease the flow of CO2, or the raise pH setpoint, depending on how you control it.

Potatohead · Dec 10, 2020

Agree with Randy

Although to answer the OP typically you would reduce the flow through the reactor.

Randy Holmes-Farley · Dec 10, 2020

Potatohead said:
Agree with Randy

Although to answer the OP typically you would reduce the flow through the reactor.

If you control by pH, that's a good way. If the CO2 is on a needle valve, reducing water flow may not decrease the delivery of alk and calcium.

Potatohead · Dec 10, 2020

Correct that method only really works if you are controlling the pH within the reactor. If you are winging it old school style I would just decrease the bubble count about 20% and go from there.