Hydroponics Koi Pond Filter Experiment -Getting Started

This is my try at a hydroponics Koi pond filter. If this works out, it solves two problems with one solution. Keeping the nitrates down in a Koi pond is always a challenge, couple that with an interest in hydroponics, this seemed like a good approach it solving both problems. This setup is temporary, after all, it is an experiment. If this is successful, I'll build a permanent frame and add two more levels to it next year. The system itself is somewhat of a hybrid. It works like a closed loop system but is using water from the pond that runs through the hydro setup and then gets returned to the pond. I did one thing not mentioned in the video and that is to test the PH of the water. It is 6.8 which is just slightly more acidic than neutral so I should be good with that. I'll post an update in a month to show how this is going.
You can also read the article at https://extremediy.org/hydroponics-koi-pond-filter-part-1/