Ph controller and solenoid question.... - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 10-05-2005, 08:27 PM Thread Starter
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Ph controller and solenoid question....

Hi everyone,

I know there are many questions about ph and CO2 but I can't seem the answer to my cousin's question...and I don't know the answer myself.

Scenario:

- Ph parameter is at a constant 6.4 (plants, fishes in a 125 gallon)

- Now...if we turn on the CO2, which will drop ph, then what good is the ph
controller? It'll never reach 7.0 and the solenoid will never shut off the CO2.


Please help, and if I'm wrong on anything...please feel free to chime in! Thanks!
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post #2 of 5 (permalink) Old 10-05-2005, 08:44 PM
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What is the kH?

And you can set the pH controller to what ever point you need, within limits of course.
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post #3 of 5 (permalink) Old 10-06-2005, 01:02 PM Thread Starter
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Don't know what the Kh is, would have to ask him.

So, is the ph controller suppose to stop the ph from falling below a certain level?
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post #4 of 5 (permalink) Old 10-06-2005, 01:25 PM
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It works the opposite of that. The controller turns on the solenoid when the PH reaches a certain level. When the solenoid is on, co2 starts to enter the tank. Co2 will lower the PH. In our case the controller isnt to keep a steady PH it is to keep a steady co2 level in the tank.

jB
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post #5 of 5 (permalink) Old 10-06-2005, 01:27 PM
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Quote:
Originally Posted by eeng168
Don't know what the Kh is, would have to ask him.

So, is the ph controller suppose to stop the ph from falling below a certain level?
Jason is correct, a level, which you set. I personally have mine set at 6.5 with a KH of 100 ppm or 5.6 degrees for around 50 ppm CO2. The pH actually swings from a low of 6.4 to a high of 6.7, which is generally when the controller kicks on.


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