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    Thread: Head on Sand and Gravel filters.

    1. #21
      LoriP is offline Senior Member
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      Quote Originally Posted by icu2 View Post
      One thing the "up and over" version can do is you can skip using a check valve if you normally
      would need one. Drill a small hole in the incoming flow pipe (the red arrow) and it'll break the siphon
      effect if you should lose power. But feeding it from the bottom is for sure less head.

      Attachment 586546
      Yup! Remembered to use that trick right after the first time I turned the pump off and siphoned them. Sure took care of it before the next time.

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    2. #22
      kimini is offline Senior Member
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      Quote Originally Posted by icu2 View Post
      So those don't matter? Doesn't the pump still have to pump it higher than if it was fed
      from the bottom and through 2 additional 90's?
      The pipe bends and length do matter, but they aren't solely what determines dynamic head, since static head is a bigger part of that. No matter how the water makes its way into the barrel, static head is set by the height of the water in the barrel, not the pipe routing. There's probably a better way of explaining it but I'm tired...

    3. #23
      icu2's Avatar
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      Quote Originally Posted by kimini View Post
      The pipe bends and length do matter, but they aren't solely what determines dynamic head, since static head is a bigger part of that. No matter how the water makes its way into the barrel, static head is set by the height of the water in the barrel, not the pipe routing. There's probably a better way of explaining it but I'm tired...
      My post said one route has more head than the other. I don't think I ever said the extra bends and length were solely what
      determines all the dynamic head, or whether dynamic or static head makes up the majority of head. But if one has more pipe
      and more 90 degree fittings (the up and over version) than the other (fed from the bottom of the filter version), and they both
      have basically the same static head, then I guess I'm missing how one doesn't have more total head than the other. I'd be
      interested to hear how that works when you have time. I'm here to learn.
      --Steve



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