BEST DIY KOI POND FILTRATION SYSTEM
My Link on how to build this system.
This is my Koi pond filtration system with a 55 Gallon sand and gravel filter and 2, 55 gallon biological filters.
The pond is in 100% sunlight and overstocked. However the maint routine keeps the water 100% gin clear all year long and good water parameters when testing as well.
That’s the inventor of the filter and how to DIY. Good luck any questions feel free to ask.