The Planted Tank Forum - View Single Post - first pond..need some advice
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Old 10-26-2012, 05:38 AM   #25
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you need 100 gph for each inch of a sheet of water fall,
so for an 18 inch wide fall you need at least 1800 gpr.
I would also estimate your pond's volume ahnd try to turn the pond over at least once per hour
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