In Central Florida, Saint Cloud. I have available two 50 gallon strapping material bio filters. (Birdmans design) manifold for backwashing, 3” in and out. With about 4000 ft of material. Lots of surface area.
We are moving away so I safely rehomed my koi, and won’t need the extra bio for just a garden pond. Worked fabulous for 11 years, 4500 gallon, heavy fish load. Learned it all here! Also have a single 50 gallon SC 4” in, 3” out. (Keeping one I think) it’s free of charge..