To achieve Koi pond aeration, there are some things you can do. One, you can go to your local hobby store or pet supply store and purchase one of those small air pumps, hook some tubing to it, along with an air diffuser or sometimes called an air stone, and place it in your pond. I still have the original one I bought about eight years ago, and it's still working. This has run for almost eight years non-stop, they are very durable. It works two fold, one, to supply air to the pond water and, two, it helps to keep a hole open in the ice during the winter.
Another way to obtain Koi pond aeration is to have different kinds of under water pond plants such as Anacharis and Hornwort. These plants will grow and spread out very well under water. Just kind of put them in small bunches in the bottom of your pond. Just so you know if your plant them in some kind of pot, chances are very good that your Koi will pull them out. Koi are always tugging and uprooting something.
Waterfalls also provide a great way to help aerate the Koi pond. By constantly having water running down a waterfall and crashing into the pond, will help naturally aerate it.
The combination of all the above suggestions will give you the results you need for proper Koi pond aeration.
Robert Dorrance has had a pond for the last eight years and would like to share his experiences with you. Be sure to come by and download the free e-book, How To Build A Beautiful Backyard Pond. Find out more at http://www.Backyard-Pond-Guide.com