i have a koi pond about 3500 gallon. i have a lava rock filter barrel and a pond filter for a 2000 gallon pond.also i have a milk crate homemade filter around the pump which work pretty good.
but the pond is still not clear and it a koi pond so there is no plants in it.
-1 koi 15 inch
-1 koi 13
-2koi 10
-1 koi 9
a few small goldfish couple of inches
what else can i add to my pond? any good idea for more homemade filter to add