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Old 12-07-2004, 06:59 PM   #1 (permalink)
 
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hi all

I am using a JBJ regulator/bubble counter, Milwaukee pH controller, and a Reactor 1000 on the outtake line of my Eheim 2126.

There's about 3 feet of CO2 tubing from the Reactor 1000 to my JBJ regulator. I'm doing a gradual bubble rate of maybe one bubble every few seconds (for gradual pH change).

Well, I came home tonight to find that my desired pH had been reached, so the Milwaukee pH controller, as expected, shut off my CO2. That's fine. What concerns me is that water from the Reactor 1000 went up the CO2 line all the way to the tip of the bubble counter. Now, I know the JBJ has a built in check valve, but shouldn't I be concerned about water flowing up the CO2 tube from the Reactor 1000 to the JBJ every time the CO2 shuts off? I'm thinking maybe I should install another check valve closer to the Reactor 1000 - what do you think? To clear the tube I manually turn the CO2 on high for a few seconds... or, perhaps my bubble rate might eventually clear the tube, but again I'm using a slow bubble rate, might take a while.


I looped my CO2 tubing in an incline by the Reactor 1000, but alas the water went up the incline and came back down to the JBJ. Thoughts? Recommend another brand of check valve?

thanks!
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Old 12-07-2004, 06:59 PM   #2 (permalink)
 
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hi all

I am using a JBJ regulator/bubble counter, Milwaukee pH controller, and a Reactor 1000 on the outtake line of my Eheim 2126.

There's about 3 feet of CO2 tubing from the Reactor 1000 to my JBJ regulator. I'm doing a gradual bubble rate of maybe one bubble every few seconds (for gradual pH change).

Well, I came home tonight to find that my desired pH had been reached, so the Milwaukee pH controller, as expected, shut off my CO2. That's fine. What concerns me is that water from the Reactor 1000 went up the CO2 line all the way to the tip of the bubble counter. Now, I know the JBJ has a built in check valve, but shouldn't I be concerned about water flowing up the CO2 tube from the Reactor 1000 to the JBJ every time the CO2 shuts off? I'm thinking maybe I should install another check valve closer to the Reactor 1000 - what do you think? To clear the tube I manually turn the CO2 on high for a few seconds... or, perhaps my bubble rate might eventually clear the tube, but again I'm using a slow bubble rate, might take a while.


I looped my CO2 tubing in an incline by the Reactor 1000, but alas the water went up the incline and came back down to the JBJ. Thoughts? Recommend another brand of check valve?

thanks!
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Old 12-08-2004, 06:45 AM   #3 (permalink)
 
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Yes, CO2 is hygroscopic and it will dissolve into the water, and pull water into the tubing. I've seen it go 1 inch /hour through 6 feet of tubing. I think the concept with the CO2 controller is that it will keep operating at the CO2 set point. You obviously overshot your setpoint, and then the controller had to shut off for an extended period. The controller should be operating "ON" at least half the time, then this won't happen. A check valve at the reactor is still a very good idea, for those times the system is OFF, for instance when your CO2 tank is empty and you are getting a new one.
There needs to be a needle valve and a check valve in the controller line.
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Old 12-08-2004, 08:31 AM   #4 (permalink)
 
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since my tank is not yet planted, perhaps this explains the lengthy times between CO2 injections (CO2 is not getting used up very fast, so the pH is remaining stable, so the CO2 unti stays off longer). I'm doing the CO2 now just to test it all out.
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Old 12-08-2004, 05:49 PM   #5 (permalink)
 
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This may be true, especially if you have no surface agitation. You can add that with an airstone. I have a heavily planted tank, and I keep an airstone running 24/7. I find that it stabilizes the ph swings between night and day by providing a continuous CO2 sink to the atmosphere. Of course, I don't use a controller. I researched the subject and almost bought one, but decided it didn't add enough value to justify the cost, and having the controller lowered reliability of the completed system too much. I'm not arguing with your decision to use one, I just couldn't justify it for my own use.
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