Homemade Filter for a Duck Pond

Written by kim joyce
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Homemade Filter for a Duck Pond
Natural nutrient "recycling" is important to maintain water quality in duck ponds. (Duck swimming in a pond 20080519-1180838 image by SIGNSofMIND from Fotolia.com)

Keep your duck pond as "natural" as possible. "Puddle ducks" such as mallards, pintails and teals need shallow water, where they feed on insects, seeds and aquatic plants, though they may also "graze" and nest in nearby vegetation. "Diving ducks" prefer deeper water, whether they nest over water, on shore or in trees. Natural, biological water-filtration is best, so shoreline and aquatic plants will constantly recycle nutrient-rich water to produce edible vegetation and oxygen. Choose plants that serve both pond and duck needs. Add a simple homemade pond filter to help filter out algae and produce the cleanest possible water.

Skill level:

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Things you need

  • Square basket for pond plants (at least 10" x 10" x 6" deep)
  • Large swamp cooler pad
  • Scissors
  • Clothespins
  • Submersible pump
  • Clean gravel

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  1. 1

    Trim the swamp cooler pad so that it fits inside and around all sides of the plant basket to create the filter surface. For a basket that's 10 inches square and six inches deep, the trimmed pad should measure 46 by 36 inches.

  2. 2

    Put the basket in the middle of the trimmed swamp cooler pad and 13 inches away from three of its sides. Fold the pad up and over each of the three sides of the basket, so each is lined with filter padding inside and out. Secure the filter padding temporarily with a clothespin.

  3. 3

    Fold the final side of filter padding up and over the fourth basket then stretch it across the bottom. Scatter gravel over the padding, especially around the edges, to hold it in place.

  4. 4

    Place the pond pump inside the basket. Fill the plant basket with gravel and completely cover the pump. Place the completed filter at the bottom of the pond. Plug in the pump--unless it's a solar pump--and turn it on.

  5. 5

    Clean the filter by removing it from the pond every month and hosing it down. Don't remove all the aromatic muck collected in the filter padding, because beneficial bacteria is thriving there--and in the pond water--that help maintain the water quality.

Tips and warnings

  • Emergent and submerged plants, floating plants and shoreline vegetation will help balance nutrient levels in your duck pond and minimise algae growth.

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