Simple Koi Pond With Biofilter

This is my simple backyard Koi pond with a bio filter. The bio filter is made from a concrete mixing tub from Home Depot with two bulkhead one bulkhead is connected to half inch irrigation, flexible rubber hose and irrigation attachments. The other bulkhead is a three-quarter inch bulkhead for the drain and there’s neck cups on top of those bulkhead to prevent the clay media from going down into the pond. The pond itself is 4 x 8 it uses a rubber pond liner and is secured by the pressure treated 2 x 6 x 8 boards.