calcium reactor issue

[kai hen]

Base on BRS investigates. ph at 6.8 and 5ml flow rate I should get like at least 19dkh. I knew it depends on what media you use.
the thing is i use ARM MEDIA and whatever i do like lower ph to 6.5 or increase flow rate or lower flow rate.
i try 6.5 ph and 6.8 both get 11dkh at same 30ml. or lower flow rate to 10ml at 6.5 or 6.8 still same 11dkh.
i use reef octopus cr140 dc pump version. am i doing something wrong?
help please. already set up a week.

 

[vetteguy53081]

Im having same issue and will tweak to 6.3 and it slowly drops again. Frustrating it is and i even have limits set bia my Apex.
My alk gets as high as 14.0
Im told to bring it up higher than set limit allowing effluent to shut down to allow drop in alk. Rarely does unit cooperate

 

[kai hen]

Im having same issue and will tweak to 6.3 and it slowly drops again. Frustrating it is and i even have limits set bia my Apex.
My alk gets as high as 14.0
Im told to bring it up higher than set limit allowing effluent to shut down to allow drop in alk. Rarely does unit cooperate

When I find answer I let you know

 

[Rick.45cal]

If it was mine I would increase my CO2 input and leave the flow rate alone. Wait 24 hours and test your dKH of the effluent again, if it’s not 20+ I’d increase my CO2 some more, but I’m not allowing the Apex to control my solenoid

 

[kai hen]

If it was mine I would increase my CO2 input and leave the flow rate alone. Wait 24 hours and test your dKH of the effluent again, if it’s not 20+ I’d increase my CO2 some more, but I’m not allowing the Apex to control my solenoid

Emmmm I use apex to control carbondoser. I run like 10second per bubble now. Pretty stable ph.

 

[Rick.45cal]

Emmmm I use apex to control carbondoser. I run like 10second per bubble now. Pretty stable ph.

You need to lower the pH farther in the reactor to increase the effluent dKH

 

[kai hen]

You need to lower the pH farther in the reactor to increase the effluent dKH

Like 6.3？ because of ARM media ？

 

[Rick.45cal]

Like 6.3？ because of ARM media ？

Yeah, ARM requires a lower pH compared to other medias.

 

[vetteguy53081]

Emmmm I use apex to control carbondoser. I run like 10second per bubble now. Pretty stable ph.

Same here and also using carbon doser

 

[vetteguy53081]

Yeah, ARM requires a lower pH compared to other medias.

Im using reborn and remag

 

[Sallstrom]

Calibrate the pH probe? Or don't pay that much attention to the meassured pH and increase the CO2 some at the time and continue meassure the outcoming dKH

 

[Rick.45cal]

Im using reborn and remag

So I tune my CaRx differently than y‘all. My CO2 solenoid is always open and the CO2 and the reactor reach an equilibrium. My flow rate is controlled by a peristaltic pump and I don’t adjust it. If my reactor isn’t keeping up, or when I’m tuning it and the effluent dKh is too low, like you are experiencing, I simply increase my CO2. Relying on a pH probe or controller to stay accurate over a long period of time is a mistake in my experience. So I don’t allow the controller to operate the solenoid.

CO2 is the only variable that is directly related to the amount of CaCO3 dissolved, if you increase that you will increase the dKH of the effluent. (This is true unless your controller is turning off your CO2 solenoid at a specified pH set point.)

 

[vetteguy53081]

So I tune my CaRx differently than y‘all. My CO2 solenoid is always open and the CO2 and the reactor reach an equilibrium. My flow rate is controlled by a peristaltic pump and I don’t adjust it. If my reactor isn’t keeping up, or when I’m tuning it and the effluent dKh is too low, like you are experiencing, I simply increase my CO2. Relying on a pH probe or controller to stay accurate over a long period of time is a mistake in my experience. So I don’t allow the controller to operate the solenoid.

CO2 is the only variable that is directly related to the amount of CaCO3 dissolved, if you increase that you will increase the dKH of the effluent. (This is true unless your controller is turning off your CO2 solenoid at a specified pH set point.)

My controller is turning it off at specific point which I rarely reach