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Air Diffusers for Ponds and Fountains

What is an Air Diffuser?

Air Diffuser is an ideal addition to oxygenate and circulate the water in your pond or water garden. An air stone in the bottom of a pond will not add any oxygen into the pond until the bubbles reach the surface and break. As the bubbles float to the surface of the pond they bring along the water from the bottom of the pond which is usually low in oxygen. This creates a constant current of water moving from the bottom of the pond, where the oxygen level is low, to the surface where it can pick up oxygen.

Common Pond Diffuser types:

Disc diffusers: Have a larger surface area than stick diffusers and often more holes. Disc diffusers typically create more back pressure, however.

  • Membrane disc: Usually a fine bubble diffuser (some medium bubble available) made from EPDM rubber. They are easier to clean than an air stone diffuser, but still require regular maintenance and can crack over-time.
  • Ceramic stone disc: Usually fine bubble (some medium bubble available) and the standard go-to for aquarium, koi ponds, and ponds with a large/ dense fish population. They can typically clog very easily and require constant maintenance. They also need to be replaced more frequently.

Stick diffusers: Have smaller surface area, but typically put less pressure on the aeration system and are better for pond mixing.

  • Membrane stick: Usually fine bubble and made from EPDM rubber with the same characteristics as the disc version. There are some medium pore membrane diffusers.
    Ceramic stone: Usually fine bubble with the same characteristics as the disc version.
  • Polyurethane stick: Medium or coarse bubble diffusers usually made from polypropylene. They are durable, require little maintenance and rarely ever clog.
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