How to Make an Airstone

An airstone is a device that utilizes the small holes in pumice to diffuse a steady stream of air bubbles into an aquarium. Regular use of an airstone can help oxygenate an aquarium tank. Aeration of the water may improve water quality and fish health. Commercially made stones can be purchased in pet stores; however, you can make your own with items that are commonly found at the local pharmacy or hardware store.

Things You'll Need

  • 3- by 2-inch pumice stone
  • Flat-head screwdriver
  • Air pump
  • 2 feet plastic air tubing
  • Fish-safe silicone
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Instructions

    • 1

      Use a flat-head screwdriver to grind a hole into the pumice stone. Place the pumice on a table and turn the screwdriver head against the center of the rock. Make a hole that is approximately the same width as the diameter of the air tubing. Stop when the hole is approximately 1/2 inch deep.

    • 2

      Place an end of the plastic air tubing in the hole. Use your finger to spread an aquarium-safe silicone around the perimeter of the tubing to create an airtight seal.

    • 3

      Place the opposite end of the tubing on the outlet valve of the air pump.

    • 4

      Place the airstone in the corner of the aquarium. Run the tubing under the aquarium rocks and up the corner of the tank.

    • 5

      Plug in the air pump to create airflow to the stone. The air will then bubble through the small holes of the pumice.