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  • Results 1 to 6 of 6

    Thread: rdf height

    1. #1
      bobbd's Avatar
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      rdf height

      Does the top of an RDF have to sit as high as the pond water level, just planing head for filter room. Thanks

    2. #2
      friscoponder is offline Senior Member
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      the waste port has to be at or above the water level. Otherwise, the pond will drain when the pump(s) are off.

    3. #3
      Zac Penn's Avatar
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      All RDF's are a little different in height above water level but most of them are close to the 6" mark. That means at least 6" of the filter needs to be above max pond water level. If you are planning for a future filter install, you also need to take into account maintenance room on top of the filter. I would suggest you have at least 2' of air space above the filter just in case.
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    4. #4
      rcmike is offline Supporting Member
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      Quote Originally Posted by Zac Penn View Post
      If you are planning for a future filter install, you also need to take into account maintenance room on top of the filter. I would suggest you have at least 2' of air space above the filter just in case.
      You could do like I did and have the roof hinged also. I tried to insert it as an image but it didnt' work.

      http://www.koiphen.com/forums/attach...6&d=1505517503



    5. #5
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      the top of mine is 3" above the top of pond everyone's is different. just go deeper then you think you need and you can always raise the rdf to the proper level
      Three may keep a secret, if two of them are dead. - Benjamin Franklin.

      you cant fix stupid no matter how hard you try.

    6. #6
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      yeah all rdfs are different and given the flow rate etc the height changes. imo you can't really can't go to low on the roof height using a hinge type setup to lift the top. taller seems to be better. for those in colder temps a simple 100 watt heat light can keep the filter house warmer also.
      Last edited by kevin32; 12-02-2017 at 10:06 PM.

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