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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