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  • Results 1 to 14 of 14

    Thread: Radial Flow Settlement Specs?

    1. #1
      Peppy is offline Junior Member
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      Radial Flow Settlement Specs?

      Hello there. I posted a diagram of a proposed filter setup for opinions but it might have been too confusing. What I really need help with is the radial flow settlement tank.

      Does anybody have experience with those? Would this work? If yes, how big around should the stilling wells be?

      Any advice is very much appreciated.

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    2. #2
      icu2's Avatar
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      I've never used a RFS type filter because I always needed more flow than it sounded like
      they could provide, so I won't try and judge whether it'll work or not but I do remember one
      build that used one so I'll link to that and maybe they'll be some info in there that'll help.
      Unfortunately I tried some of the links of info in the thread that was posted and many were outdated,
      but there it seemed a few still worked.

      https://www.koiphen.com/forums/showt...-my-small-pond

      I do like the no niche skimmers used as pickups... one thing I might do differently is enter the filter
      from the pump lower in to the container and make an L shape into the bottom of the no niche, which
      is how mine came manufactured. That way if you don't use glue you can always adjust it if the draw down
      is more than the no niche can handle.
      --Steve
      ..WWKC Treasurer


    3. #3
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      Quote Originally Posted by icu2 View Post
      I do like the no niche skimmers used as pickups... one thing I might do differently is enter the filter
      from the pump lower in to the container and make an L shape into the bottom of the no niche, which
      is how mine came manufactured. That way if you don't use glue you can always adjust it if the draw down
      is more than the no niche can handle.
      Thank you icu2 for taking the time to answer my post and to provide a link which I'm sure wasn't easy to find especially from so long ago. Really really appreciate it. Watched Sweetwater's youtube video and left a comment and a like. His video and thread gave me the answers I need which are how much flow can I put into a stilling well and what size pipe.

      Yes, I know what you mean about the skimmer. The one I'm using in my current pond also came with a bottom hole but I closed it off and came in from the side so I could use a 2-inch pipe. That let me use one less 90 and install the pipe a bit higher on the liner. Then I put a ball valve on the pipe to adjust the draw down since there is a mid-water pickup on that line too so this way it's not restricting flow to the pump.

      I got the skimmer-as-pickup idea from Kent Wallace but can't find him anywhere. He was super helpful when I was redoing my current pond.

      Anyway, thanks so much that information was exactly what I needed.

    4. #4
      icu2's Avatar
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      You're sure welcome! Glad it helped.
      It looks like there are some more threads about them too that might help see what has
      worked and what hasn't for others if you haven't seen them already... just type radial flow
      in the Google search bar:

      http://cse.google.com/cse?cx=0070364...19978874%252Fc
      --Steve
      ..WWKC Treasurer


    5. #5
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      Thanks! I have typed radial flow into so many forums and youtube and google but this is the first time that I ever saw that video by sweetwater which I got to from the link to his post that you provided. And that video is the one that finally answered my questions. Yay!

    6. #6
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      Name:  Radial Flow Separator v,2.jpg
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      Dimensions 4X4X4 box with corners added to make octagon. EDPM liner. blue barrel is 50 gallon with top & bottom cut out. Flow about 4,000-4500 gph. Running about 10 years. Very happy with results.

    7. #7
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      Name:  RFS01.jpg
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    8. #8
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      Radial flow settlers work well because of even distribution discharge in a RADIUS from the stilling well. All have a radial notched pickup weir for water return. This utilizes the entire tank, greatly slows flows and eliminates channeling. Slowing flows down and no channeling results in more particulate drop. Water always tries to flow the path of least resistance.

      Your design will channel and I'm not sure it'll out perform a vortex. Putting the flow in a linear reversing path with the stilling wells helps separate solids but this filter will have definate high flow channels that will carry additional solids.

      Projected main flows in red. Maybe yours is a linear or reverse flow settler? It'll probably work but will never be as efficient as a RFS and it might not outperform a conventional vortex.
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      Last edited by batman; 05-23-2021 at 09:01 AM.
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    9. #9
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      Here's a photo of Kent Wallace's design. Not a true RFS but it at least has multiple pickups to help eliminate channeling.
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    10. #10
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      RFS technical specifications:

      Notice on a 36 inch diameter RFS the max flow recommend is only 1,728 GPH.
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      Last edited by batman; 05-23-2021 at 09:38 AM.
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    11. #11
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      More good information thank you so much John. gph and sizes--that's the type of info I need.

    12. #12
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      Thanks batman for the picture of Kent's design. I see what you mean now about channeling. I'd have to use two barrels then (which I do have barrels) for a 3500 gph pump to get below the 1750gph but couldn't fit the skimmers in there. I like the skimmers because they give me wiggle room on water level.

      I wonder if anybody has come up with a floating weir design? I'm not great at DIY but could copy somebody's design with good instructions.

    13. #13
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      Here's an interesting design alternative posted on a Koiphen thread.
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    14. #14
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      Quote Originally Posted by batman View Post
      Here's an interesting design alternative posted on a Koiphen thread.
      I apologize for my absence. Been getting ready for camping and now here we are camping.

      Thank you so much for taking the time to post a diagram! I'm so terrible at anything mechanical. So the water is coming in at the top. Never seen anything like that. Certainly solves my channeling and size problem. Do you think it work with a no niche skimmer as the #4 weir? That would solve the changing water level problem.

      Sure am glad I posted my design here for review. Really glad. Thank you so much.

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