Alkalinity problem with new reactor media

Discussion in 'Test Kits, Controllers, Reactors and Dosers' started by gaboon, 23 Jan 2011.

  1. gaboon

    gaboon

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    I've switched to the extra course ARM media and now I'm only getting about 12 KH out of the reactor, the PH is set to 6.35.

    I'm using the Reef Octo CR100 reactor.

    Any ideas?
     
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  3. Nemos Janitor

    Nemos Janitor

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    Yup you need to get the KH up to about 40. If your pH lower than 6.5 you will have to reduce the flow through the reactor. But first. How long has the media been in the reactor?
     
  4. gaboon

    gaboon Thread Starter

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    Been in for a week. The PH is controlled by the profilux. When I tested it this morning the drip rate was 2 drops a second.

    I've increased it now to about 8 drops a second. The PH doesn't go above 6.4.
     
  5. Nemos Janitor

    Nemos Janitor

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  6. gaboon

    gaboon Thread Starter

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    Thanks Nemos but its been working perfectly for 2 years with the small media. The PH probe is calibrated as well. Could the extra coarse media be for specific reactors?
     
  7. Nemos Janitor

    Nemos Janitor

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  8. gaboon

    gaboon Thread Starter

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    Thanks Nemos, I'll reduce the PH to 6.1 and check again in a couple hours.
     
  9. Alan

    Alan Admin MASA Contributor

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    Gaboon i have not used carx in a very long time but from what i can remember, with that low ph, slow the flow down a bit, back to 2 or even one drop a second. The finer the media the better as you have more contact time with the media itself ie less tracking of the water.
     
  10. gaboon

    gaboon Thread Starter

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    I think I'm missing something here.. if there is a constant 6.35 PH in the reactor, how does the contact time make a difference?
     
  11. Alan

    Alan Admin MASA Contributor

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    The larger the particles are, the less surface available, with the finer the particles there is a larger surface area in contact with the water at all times, as i said i havent used a carx in years, but always used the finer particles as my reactor was always undersized.
     
  12. Alan

    Alan Admin MASA Contributor

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    Sorry, missed the question there, the longer the water stays in the reactor at lower PH the more saturated it will become with ca and alk.
     
  13. gaboon

    gaboon Thread Starter

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    Reduced the drip rate to 1 per second and left for a few hours, only managing to get about 16dkh. Could this extra course media not be suitable for fluidised reactors? (Reef octo CR100)
     
  14. gaboon

    gaboon Thread Starter

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    Does anyone use the coarse media?
     
  15. Mekaeel

    Mekaeel Moderator MASA Contributor

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    About to use the media soon Gaboon. Looks like Alan has explained it pretty well. Contact time on on the large surface area will take much longer. Best to reduce the drip rate and monitor over a few days. At one stage I found myself driving my reactor very hard, injecting lots of Co2 and a high drip rate to keep my tank KH at 8 and Ca at around 410. The Alk of the effluent out of the reactor was between 15-21.
     
  16. gaboon

    gaboon Thread Starter

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    Would that not drop the tanks PH? How long did your Co2 last?
     
  17. Mekaeel

    Mekaeel Moderator MASA Contributor

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    It does drop the Ph of the tank. That is why I had to use Kalk and made sure the tank had an adequate oxygen supply by leaving the windows open 24/7. The ph use to run at 7.7 at times (all livestock was still healthy). The 2kg Co2 bottle use to last me about a month to a month and a half.
     
  18. gaboon

    gaboon Thread Starter

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    Think I'm gonna have to replace it with the finer media then.
     
  19. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Gaboon, what is the Alk of the tank?
     
  20. gaboon

    gaboon Thread Starter

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    Its always been stable at 8 with the finer media up until last week when I added the coarse stuff. I assumed everything would be the same until I saw the tanks PH and realised the alk was out. It was 5 yesterday morning. Luckily I had some KH builder on hand to restore it.
     
  21. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Increase the drip rate and and increase the amount of Co2 entering the reactor. But monitor the Ca level as well. Too fast a drip rate will increase your Alk but drop your Ca level.
     
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