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No More Water Changes – Koi Pond

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


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Raised Wooden Koi Pond – Filtration


When you’re building a pond, sooner rather than later, thoughts turn to pond filtration. In addition to the volume of your raised wooden Koi pond, you need to think of filtration. Without filtration, your raised Koi pond and the Koi fish, will simply suffer and eventually die. It is quite alarming how many fish ponds are built, without any filtration. A Wildlife pond may be fine with wild pond plants and attracting wildlife, but having no fish stock. However, a fish pond and especially a Koi pond needs a lot of high-quality filtration.

My feelings on filtration, whether this be for a fish tank and I’ve had many cold water, tropical and marine fish tanks over the years – usually getting larger and larger. I’ve also had quite a few ponds over the years, which again have got larger and larger. Currently, I have a Stretched Octagonal Raised Wooden Koi Pond in my own back garden. In fact, the video you see on the home page of this website and on the YouTube Channel is that very same raised wooden Koi pond. The Mirror Carp that you see in that video was from a much smaller pond. Now, the pond also has some Koi Carp too – videos of which I will be doing soon. I digress. My thoughts and feelings on filtration is to always, always over-spec your filter equipment. By that I mean, if your pond is say 1000 gallons, have a filter system that is stated as working with over twice that. at least. The reason being is that many filters are quoted as working on very low stock ponds. It’s fair to say, that fish keeping, whether that be cold, tropical, marine or fancy or Koi, ultimately we tend to buy more than we planned. Obviously don’t go crazy, but it is quite common to see ponds overstocked. Which can be a real problem, if the filtration can’t handle the amount of fish. 

Quick things to consider when setting up a fish pond and especially a Koi pond:

  • Filtration at least x 2 the recommended volume.
  • Bead Filters and Bakki Showers (I will write more about these) are a worthwhile investment in a Koi pond.
  • Install a UV filter to stop your pond water turning green.
  • High volume air pump and large air stones (aeration is hugely important)
  • Buy a quality water testing kit.
  • Understand the Nitrogen Cycle (I will write more about this too), which your pond will go through.
  • Use a chlorine inline filter when adding water to your pond, this will save you a fortune on chlorine removal products.
  • Keep stock very, very low at the start, certainly for the first 3 months. To allow your pond to cycle and build beneficial bacteria. Consider adding products that contain beneficial bacteria to boost that start up cycle.
  • Water changes once a week; 25% of the water volume.

I will be writing more about each of these points over the next few weeks. So keep posted and if you have any questions related to Koi or Fish ponds. Please contact us via chat (bottom right button of the screen) or simply use the contact page