Part of keeping Koi fish happy and healthy is of course water management. Making sure the water is as clean and safe as possible. There are various recommendations as to how often and how much water you should change each week. 10% per week, seems to be about the going average. For small ponds that may not be too much of a problem, for larger Koi ponds that can be somewhat of a headache. To that end, I use the following method:
Constant Water Change
Reverse Osmosis Filter
Using a three-stage reverse osmosis water filter, feeding into the pond at a constant rate, allows for a constant exchange of water. These can be hooked up pretty much anywhere and the small-diameter hose, can run very long lengths, in fact, it can be easily buried or hidden. These can be purchased easily online.
Self Priming Siphon
Now, of course, having the pond constantly fill up with water means that it will overflow. To that end, it’s very easy to build a self-priming siphon, that will keep the water at a constant level. They are easy to build and plenty of video guides on YouTube will show you how.
By using the above method in my own raised wooden Koi pond, enables me a good degree of freedom. There are of course times when I do need a larger water change. I’ve written an article about dechlorination solution and how to save money on large water changes. Take a look at it here: how to make your own dechlorination solution for your Koi pond