How do I sink my pond air line?

Sink your pond air line by placing small rocks and other items over the tubing - not too heavy to restrict air flow, but enough to keep it floating to the surface. Alternatively use "Sinking Airline" which is already weighted.

Article photo for How do I sink my pond air line?
Learn how to sink your pond air line and the benefits of adding extra oxygen to your pond water

Table of Contents

Installing a pond air line is crucial for maintaining the overall health of your pond, as it provides necessary oxygen for your fish and aquatic plants. Properly sinking the air line ensures that the system functions correctly and remains discreet. In this article, I'll guide you through the process of sinking your pond air line and discuss the benefits of doing so.

Why is a pond air line important?

A pond air line delivers oxygen to your pond, which is essential for the survival of your fish and aquatic plants. Oxygen is necessary for respiration, decomposition of organic matter, and maintaining a healthy ecosystem. A well-oxygenated pond also helps to keep mosquitos at bay by promoting the growth of beneficial bacteria that control mosquito larvae (read more about Pond Pests).

Choosing the right air line


When selecting an air line for your pond, consider the material, size, and length. The air line should be made of high-quality material, such as PVC or silicone, to ensure durability and flexibility.

The size of the air line should match your pond's air pump and air stones, while the length should be adequate for reaching the desired location in your pond. If you're unsure about the right air line for your pond, consult our comprehensive guide on which pond pump you need.

How to sink your pond air line

Follow these simple steps to sink your pond air line:

  1. Clean the area: Before installation, clean the area where you plan to sink the air line. Remove any debris, such as leaves, algae, or rocks, to ensure a smooth installation process.
  2. Attach the air stone: Connect the air stone to one end of the air line. The air stone will help to diffuse the air bubbles and promote better oxygen distribution in your pond.
  3. Weigh down the air line: Attach a weight, such as a small stone or a suction cup, to the air line near the air stone. This will help to keep the air line and air stone submerged.
  4. Submerge the air line: Gently lower the weighted end of the air line into the pond, ensuring that the air stone is positioned at the desired depth.
  5. Secure the air line: Use garden staples, rocks, or other heavy objects to hold the air line in place along the pond's edge. Make sure the air line is not obstructing any plants or affecting the water flow.
  6. Connect the air line to the air pump: Ensure that the air pump is placed in a safe and dry location, away from water. Connect the other end of the air line to the air pump.
  7. Test the system: Turn on the air pump and check for air bubbles in the pond. If everything is working correctly, you should see a stream of bubbles coming from the air stone.
  8. Hide the air line: To keep your pond looking natural and uncluttered, you may want to hide the pond air line. You can do this by burying it in the soil or concealing it with rocks and plants.

Maintaining your pond air line

Regular maintenance is essential for ensuring that your pond air line remains functional and efficient. Check the air line for any damage, such as cracks or splits, and replace it if necessary. Clean the air stone periodically to prevent clogging and maintain optimal oxygen distribution.

The benefits of a well-functioning pond air line

A properly installed and maintained pond air line offers numerous benefits for your pond's ecosystem:

  • Healthier fish: Adequate oxygen levels are essential for fish health. A well-functioning pond air line helps to prevent issues such as fish gasping for air or sticking to a corner, which may indicate low oxygen levels.
  • Improved water quality: Increased oxygen levels promote the growth of beneficial bacteria, which break down organic waste and help to keep the water clear. A well-oxygenated pond is less likely to have issues like dirty water or unpleasant odors.
  • Reduced algae growth: Algae thrive in low-oxygen environments, which can lead to unsightly green water and blanket weed. A well-functioning pond air line can help to remove blanket weed and prevent algae overgrowth.
  • Enhanced plant growth: Aquatic plants require oxygen to thrive. A properly sunk air line can promote the growth of pond plants, including lilies and other oxygenating plants, improving your pond's aesthetic appeal and overall health.

Final thoughts

In conclusion, sinking your pond air line is a crucial step in ensuring the health and well-being of your pond's ecosystem. By following the steps outlined in this article and maintaining your air line, you can enjoy a beautiful, thriving pond for years to come.