I am in the very early stages of planning a rebuild of my koi pond. I want to add bds, skimmers, returns, and good filtration. This pond/stream is over 10 years old, rubber liner, no filtration system, rock bottom. The lower pond is 18'×15' and 29" deep in the middle. The stream is about 80' long. Currently have a submersible pump in a bucket filled with filter media.
As it sits the water stays pretty clear except for string algae in the summer. I already removed most of the rocks from the lower pond and the upper pond leaks so I'm in the process of removing the rocks, the geniuses that built it put rocks under the liner with no padding.
I've got a pretty good idea of how I want to fix it but any advice is appreciated. I mainly need help figuring out what to do with the stream and choosing what types of and sizing filters. I'm pretty handy so I plan on diying the filters.