Well, I have been pondering moving my Koi indoors for the winter. They did fine last year in the extra cold 2013 Chicago winter with the pond covered and heated to 39 degrees. However, this year will be different as my house is now on the market and I would likely have to remove the Koi from the pond in the cold to make the move. I decided to bite the bullet and build a permanent indoor winter pond with the parts I had on hand. The main question I have as you read through what I have built being will I need the EVO 55 UV light or not?
I have a 300 gallon rubbermaid stock tank that I installed a 4" aerated Koi toilet bottom drain into.
From the bottom drain, the flow is all 4" unto a 55 Gallon settlement chamber.
From the settlement chamber the flow is to an Artisan A2-1/2-76-C pump then through an MC-50 vortex.
From the vortex, I run through an inline heater that I plan to keep around 68-70 degrees all the time and will feed the fish.
From heater, flow is to a Zakki Shower with Cermedia.
With the ball valves, I have the flow throttled back a bit to somewhere around 5,000 gph or enough to turn the pond over a good 15 times per hour to keep the rotation in the settlement chamber nice.
The fish load will be 8 Koi ranging in size from from 8" to 16"
IS a UV necessary? I do have one I can use but, if it is not needed, I would prefer not to plumb it in.