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Thread: Pond returns
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16-01-2025, 05:47 PM #1Junior Member
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Pond returns
Evening all,
Should I be looking at 1 1/2 or 2 inch returns back in to my koi pond, what are you all using ?
TIA
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17-01-2025, 08:34 AM #2Senior Member
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Go 2inch. You can always adapt to suit filters later.
2660 Gallons. 4" Bottom Drain and Skimmer. Draco Solum 16 Drum. Anoxic Filtration. Air lift returns.
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17-01-2025, 09:23 AM #3Member
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i will be using 2" on my return
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17-01-2025, 11:12 AM #4Senior Member
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Or completely leftfield, I use 4". Gravity flow from pond to half way through filter, air lift, gravity flow through rest of filter, outlet chamber and back to pond.
However, this is not in any way a conventional arrangement!
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24-01-2025, 11:12 PM #5Senior Member
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3" for me, much lower frictional loses with larger diameter pipes
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27-01-2025, 12:16 PM #6Junior Member
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4" for me.
It's the output from the airlift.
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27-01-2025, 10:36 PM #7Senior Member
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I've used 2 inch all the way on mine as the outputs on my pumps were 2 inch, if they weren't though I think I would have stepped them up to 2 inch
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28-01-2025, 08:33 AM #8Junior Member
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The next head scratcher I have is when do I put the returns in......... I will be constructing out of Breeze Block laid flat so do I put some 2 inch pipe in whilst laying the blocks and just notch a bit out of the breeze blocks or bore a hole through once all blocks are laid ? please help lol
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28-01-2025, 12:12 PM #9Senior Member
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Yes do exactly that. Lay pipe in the walls whilst building. Leave them long so you can cut them back later.
2660 Gallons. 4" Bottom Drain and Skimmer. Draco Solum 16 Drum. Anoxic Filtration. Air lift returns.
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