CO2 advice

[martym]

My RX has only one chamber
here is how Randy Homles set his up. This is from is article on Reef Central.
"A more elaborate method is to connect the solenoid valve to a pH controller and place the pH probe into the calcium reactor. The valve then switches the CO2 on and off to maintain a target pH within the reactor. I use a similar method. The pH probe is placed in the tank, and switches off the CO2 flow to the calcium reactor only when the pH in the tank has dropped too low (e.g. pH 7.8 or lower).

This is how I run it, but I try not to let the PH get that low.

[Chin_Lee]

Marty
Randy's method and your method are very different. He is using the ph controller to control the pH inside a calcium reactor whereas you are using a ph controller to minimize the pH drop in your display tank.

I wouldn't be too concerned about the pH in the tank. 7.8 isn't really bad at all as this is quite normal for many reefers that do not does kalk. Use kalk to raise the pH in your display tank via a kalk reactor on an auto topoff.

I would use the pH controller to control the pH inside the reactor only. As more effluent exits your calcium reactor, it will buffer the system and prevent it from going any lower than 7.6.

[martym]

Ok, I have now changed what I was doing. The controller is in the effluent, has the rx come on if the Ph is above 6.8 and shuts off if it goes below 6.4.
Thanks everyone for your help.

[untamed]

Originally Posted by martym

My RX has only one chamber
here is how Randy Homles set his up. This is from is article on Reef Central.
"A more elaborate method is to connect the solenoid valve to a pH controller and place the pH probe into the calcium reactor. The valve then switches the CO2 on and off to maintain a target pH within the reactor. I use a similar method. The pH probe is placed in the tank, and switches off the CO2 flow to the calcium reactor only when the pH in the tank has dropped too low (e.g. pH 7.8 or lower).

This is how I run it, but I try not to let the PH get that low.

I get it. Randy is using low-pH as an emergency shut off for the reactor (at tank ph 7.8). By setting your shut off as high as 8.0, you probably shut down the reactor for most of time that your lights are off.

[martym]

Yes that was happening. Then it would take a long time for the Ph to raise again. I have switched the way I'm doing it to what Tang Daddy suggested. I'm curious to see what happens with the Ph now

[untamed]

It will bounce up and down in a daily cycle controlled by your lights.