How to Build a Pond Aeration System
Pond aeration systems provide the most long-term benefit to your pond compared to targeted methods like herbicides, pond bacteria and water clarifiers or dyes. These treat only the symptoms and not the source of the problem. Bottom-based aeration raises the dissolved oxygen levels at the bottom of the pond, thereby preventing fish-kills from rapid pond turnover. The method reduces the amount of available phosphorus, decreasing the risk of algae blooms. Build your own pond aeration system to reap the benefits.
Use a depth-finder to determine the deepest areas in your pond. An alternative to this would be a simple weight with a line attached and "foot" markings to measure depth. Leave a float tied to a brick at the deepest point for a subsequent step.
Contact a certified electrician who can deliver electricity to the pond’s edge to power your air compressor.
Place the compressor inside the weather proof cabinet and secure it to prevent unnecessary noise and vibration. Fasten the cabinet to a concrete pad or block and bolt it down for theft prevention.
Connect the weighted air line to the compressor’s outlet and tighten it down with a stainless steel clamp. Dig a trench and bury the line underground from the cabinet to the water’s edge, and below the frost line if you’re in a cold climate.
Attach your air diffuser to the free end of the air line you just buried. Use a clamp to ensure a tight connection. Cut a length of rope as deep as your pond and tie it to the air diffuser, then tie a float to the free end of that rope. Take your boat out to the deepest point in the pond and lower your air diffuser to the bottom.
Turn on your air compressor. Let it run for no more than 15 minutes. Run the system for 30 minutes the next day and double the run time every day after that. You must follow this pattern to avoid a costly fishkill from too rapid a pond turnover, or circulation.