We have had four successful koi ponds over the last 15 years. The original pond has one of the original koi.
You do not need a UV. You do not need a filter.
What you do need is a pond with a part of it deep enough to stop racoons and herons from eating your fish (four feet).
Lots and lots and lots of oxygenating plants bedded down in clay filled planting trays with stones covering the trays. Clay because it sticks together and does not foul the water. Stones to avoid koi using their noses to disturb the roots of the plants.
Keep the pond out of the sunny area of your yard but also not near trees that will drop things into the pond.
Salt the pond to keep the koi healthy and like marine, be very very fussy about the quality of the fish you are buying.
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