Results 1 to 10 of 10
  1. #1
    Senior Member
    Join Date
    Mar 2006
    Location
    Ottawa, Ontario
    Posts
    245

    Flow through a refugium

    As part of my 125G upgrade, I am going to be adding a sump to the system. Drilled overflow will be done by LFS. It will be a 25 G long sump (16x12x30).
    Order of flow in sump will be input/skimmer->return->refugium.

    Keith at MS has suggested that it would be a better idea to use a powerhead into the refugium from the return chamber rather than split the return flow. The volume of the refugium is only going to be about six gallons. I plan to grow macro and encourage critters to grow. I would also like it to be low enough flow to allow frags to attach if possible.

    Total actual volume of the refugium is going to be about 6 gallons. My understanding is that 5-10x (or 30-60GPH) flow is the goal for a refugium. If I go the powerhead route, how do I go about rolling the flow back to such a low level?

    Only idea I have right now is to put a T off the powerhead and split the flow from the return section to both the refugium and to the return - maybe controlled by a valve.

    Anyone have any ideas?

  2. #2
    Moderator cres's Avatar
    Join Date
    Jul 2004
    Posts
    1,963
    A maxi jet 400 will only push 106 GPH wide open. With a couple inches of head pressure and some hose, you will be in the right ballpark. You could add a valve to the output to lower it further.

    Teeing off the return pump to the refugium will work, but, you do have to check the flow once in a while. As the works gums up the flow will change. Not a big issue, but, Keith doesn't like this fiddling.
    Sarchasm: The gulf between the author of sarcastic wit and the person who doesn't get it.

  3. #3
    Senior Member
    Join Date
    Mar 2006
    Location
    Ottawa, Ontario
    Posts
    245
    I wasn't thinking of teeing off the return pump. I was thinking that teeing off the maxijet so half the water went to the refugium and half just basically flowed back into the return section. I didn't realize that 8 inches of head would be a significant factor in the performance of a powerhead so perhaps I am worried about nothing...

  4. #4
    Moderator cres's Avatar
    Join Date
    Jul 2004
    Posts
    1,963
    I understand, I was just saying that teeing off your return line isn't that bad.

    If you get a MaxiJet 400, it will stop pumping at slightly over 2' of head, so, yes, 8" would be significant.
    Sarchasm: The gulf between the author of sarcastic wit and the person who doesn't get it.

  5. #5
    Senior Member
    Join Date
    Sep 2003
    Posts
    1,427
    The RC head loss calculator isn't really designed for small pumps like this but, with an MJ400 and 8" of tubing (3/4" is the smallest diameter they allow), you get about 40 GPH. They show 0GPH with 1 foot of head. Based on this, I'd go with at least an MJ600.
    Nick

  6. #6
    Senior Member
    Join Date
    Mar 2006
    Location
    Ottawa, Ontario
    Posts
    245
    Well, I see that my plan to use a Maxijet 1200 to pump water from containers on the floor into the new tank is not going to work out :crap:

    Neat calculator...

  7. #7
    Senior Member pwall's Avatar
    Join Date
    Nov 2004
    Posts
    2,326
    I wouldn't under-estimate those MJ1200's...they're really decent small pumps.
    Regards,
    Patrick.
    Ottawa (Orleans), Ontario
    Yahoo IM: pwallnfld

  8. #8
    Senior Member
    Join Date
    Mar 2006
    Location
    Ottawa, Ontario
    Posts
    245
    On the calculator, at 5-6 feet of head, they report 0 GPH

    Perhaps verification in the lab is in order, though...

  9. #9
    Senior Member pwall's Avatar
    Join Date
    Nov 2004
    Posts
    2,326
    I'm curious to know the results.
    I don't think I've used a MJ1200 at 5-6ft head, but definitely 3 when moving freshly made salt water from a 23gal container to my QT tank (total distance, about 7ft in length, but only 3ft head).
    Regards,
    Patrick.
    Ottawa (Orleans), Ontario
    Yahoo IM: pwallnfld

  10. #10
    Moderator cres's Avatar
    Join Date
    Jul 2004
    Posts
    1,963
    5-6' is too high for a MaxiJet 1200. You would either have to raise the bucket onto a 5' stool (what I did for that job), or pump into the sump (what I do more often).

    I didn't realize the MaxiJet 400 was that weak against head, the MJ600 is probably the better bet with 8" of head.
    Sarchasm: The gulf between the author of sarcastic wit and the person who doesn't get it.

Similar Threads

  1. over flow help
    By coryp in forum Lighting, Filtration & Other Equipment
    Replies: 25
    Last Post: 03-22-2011, 12:08 PM
  2. Refugium & Wet/Dry Combo or just refugium
    By tpirovol2 in forum Reef Discussion
    Replies: 1
    Last Post: 06-28-2004, 02:17 AM
  3. refugium flow?
    By Gools in forum Reef Discussion
    Replies: 7
    Last Post: 03-23-2004, 01:06 AM
  4. Too much Flow?
    By nbreau in forum Reef Discussion
    Replies: 13
    Last Post: 01-16-2004, 11:34 PM
  5. How Much Flow????
    By mouse6196 in forum Reef Discussion
    Replies: 8
    Last Post: 04-26-2003, 08:39 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •