Not familiar with the lingos gravity fed, flow up, down etc. I guess instead of water going up the barrel, why not going down like a shower?
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The sand and gravel media creates too much head to down flow without the filter being sealed. I think it would
simply overflow unless the flow was at a very slow rate.
Up flow= water fed from the bottom, exits the top
Down flow= water fed from the top and exits the bottom
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Depends on the filter and the media. A moving bed is often gravity fed and normally an up flow design but the K1 in
suspension has very little head so it works fine either way. My s/g filter media creates about 11"-17" of head so it'd be more
of a challenge to gravity this up flow design and so most people pump feed them. But it really doesn't take a big pump to
overcome that amount of head.
Steve, just trying to understand how things work. Why not down flow into 2-3 barrels each with their own returns into the pond? Also how did you measure that 11-17” head?
Time you enjoy wasting is not wasted time. ---- Marthe Troly-Curtin
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I'm just not sure what you would gain using 2 or 3 barrels in a down flowing gravity return arrangement
when you could pump feed one and flow the same?
To measure the head I pumped to another barrel set at the same height as the s/g filter outlet and then
gravity fed the s/g filter and measured how much higher I had to pump the water to create the flow at
about 2000 gph. I think the actual head measurement I show on post #50:
https://www.koiphen.com/forums/showth...-Gravel-Filter
Time you enjoy wasting is not wasted time. ---- Marthe Troly-Curtin
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Gravity water flow down flow.
Pump fed (pressure) up flow.
member
Time you enjoy wasting is not wasted time. ---- Marthe Troly-Curtin
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Sorry I missed this.
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