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Message: [QUOTE="DoDad, post: 50700, member: 1534"] Koi ponds should not be less than 4 feet deep if you want your koi to have good body conformation. Install a bottom drain at the pond bottom and make the entire floor surface slope towards this drain. Your filtration system will extract pond water for filtration from this drain. I would recommend a filter flow rate equivalent to displacing the entire pond volume within one hour. A 3,000-gallon pond requires a pump that can move 3,000 gallons of water per hour. External pumps would be the best choice because of their efficiency and long life. To me the best setup for the filters is the gravity fed system. This way the pump is the last thing the water goes through before returng to the pond. I believe that mechanical filtration should be the first place your water should go when leaving the pond. With a pump fed system anything gettin through the strainer basket is purred and harder to remove from the system. [/QUOTE]