Hey guys I have a good opportunity to set up a koi pond in my yard as there's already a huge hole in my backyard. Was gonna fill it in with dirt but thought hey, I could make this into a pond instead any advice? What's the best filtration? Ease of maintenance? Good materials, filtration, liners, words of caution, best sources of knowledge, etc. Anything helps I've never done a build like this b4. I've seen guys post pond builds on here so I'm sure someone has some great advise. Thx in advance! I'll attach a picture of the area I want to build for reference. Its pretty big. Maybe 18 ft long 8 ft wide and already 2 feet deep at the deepest part so I wouldn't have to do a ton of digging.