Koi Rescue
Phoenix Arizona

Filter for green koi hatchery tank

As of 2010, this is how I am running my koi hatchery tank with my latest filter. The green 5 gallon bucket sitting on the top left of the tank is the filter. I have been using it for about a year and it has performed beautifully.

The white barrel to the left of the tank is simply a holding tank for koi that I am adopting out. Nothing but an empty barrel, with a pump to send water from the hatchery tank to the barrel, then it returns and dumps back into the hatch tank. That way I don't need a seperate filter system for the barrel.

This is the main pump and it's intake pipe. I also have a 2nd smaller pump hiding behind it, that is the pump that circulates the water to the barrel.

Here is the main pump pulled out. As you can see, it is very simple and just hangs in place by gravity.

The bottom of the T section of the pipe has slots in it so that the water is pulled from the bottom of the tank.

I am always afraid that something will go wrong, and the pump will fully drain the tank killing my fish. To help prevent that, I have an anti-siphon hole at the elbow of the intake. Should a failure occur, the pump will loose suction as soon as the water drops to the level of the hole leaving atleast some water for the fish to survive in.

The top hose is easy to unscrew so I can quickly take the pump out of the tank to service it.

Also you will notice I have a coupler between the hose and the pump. At this time, I only have a few small koi in the tank, but when I have larger ones that need more circulation, I can swap to a larger pump which will aerate the tank better.

The water goes up the tube, then drops into the bucket.

There is an elbow where the water drops in, that is to circulate the water in the bucket to get more of an even flow amongst the K1 biomedia.

This is what it looks like with the K1 removed from the filter. The water exits through the top of the center pipe through the slits.

The bucket is only half full of K1 media, and since it floats, it forms a settlement area in the bottom half of the bucket. It works a lot better than I thought it would, and does a great job of seperating the particles out.

The center of the return pipe has biobarrels in it, so as the water drops through the pipe it gets torn up a bit to help aeration.

The bottom of the return pipe has an elbow on it so as it returns to the tank, it creates some current. This photo was taken during a water change, so the water level is normally right there at the bottom of the elbow.

The 2nd elbow is the return pipe for the 55 barrel.