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GFO question

Discussion in 'General Discussion' started by jstngates, Oct 5, 2013.

  1. Oct 5, 2013 #1
    jstngates Toledo Iowa

    jstngates Experienced Reefkeeper

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    I started running GFO 10 days ago. I have about a third a cup running with my carbon in a carbon reactor. I just tested my phosphates and it was almost .5 with the API test kit. How often do I need to changes my GFO?
     
  2. Oct 5, 2013 #2
    Chris C. Des Moines, IA

    Chris C. Experienced Reefkeeper GIRS Member

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    That is a great question with no real great answer! GFO works until it is 100% exhausted. What where you phosphates before starting to use GFO?

    Once you start using it you should see a downward trend in phosphates. Have you seen any decrease in phosphates at all?
     
  3. Oct 5, 2013 #3
    Andy The Reef Guy

    Andy The Reef Guy Inactive User

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    Once your phosphates are below 0.07 ppm you can just rinse a BUNCH of GFO and leave it in there for months. If you use a whole bunch with your po4 at 0.5ppm you will drop the po4 levels so fast that you will probably stress out corals. Its a matter of getting it dialed in. I would get a more precise test kit, and keep an eye on it. As soon as it ticks upward, change your GFO.
     
  4. Oct 5, 2013 #4
    jstngates Toledo Iowa

    jstngates Experienced Reefkeeper

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    It hasn't changed much. I changed my ro filter and membrane and it reads zero coming out of there.
     
  5. Oct 5, 2013 #5
    jstngates Toledo Iowa

    jstngates Experienced Reefkeeper

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    Can I run GFO and Phosgaard together? I have some phosgarrd I want to use up.
     
  6. Oct 5, 2013 #6
    Andy The Reef Guy

    Andy The Reef Guy Inactive User

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    No I wouldn't, Phosguard like all Aluminum Silicate absorbents quickly absorb po4 leading to coral stress, and only retains the po4 for 48hrs before it leaches them back into the water. I cannot recommend any aluminum silicate media at all.
     
  7. Oct 5, 2013 #7
    Fence13 Des Moines

    Fence13 Experienced Reefkeeper

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    I would also recommend that once you start the GFO if you ever decide to stop using it or going a different direction that you slowly ween the tank off of GFO.
     

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