| I think it is wrong to make generalizations about filter size relative to pond size. There are simply too many variable factors (fish size, temperature, #of fish, amount of food...etc) After 27 years of fishkeeping, I have found several things that make sense and work. Put on the filtration you think is appropriate...and measure your water regularly. If the ammonia and nitrite are high (after cycling)....guess what...you need more filtration!!! My last pond was 7,000 gal. I started with a 150gal waterfall filter....it worked fine when I had a few small fish. Then, as they grew(and I bought more fish)..suddenly the ammonia and nitrite were not zero anymore. I added another 50 gallon sand filter(filled with springflow)...and again, all was well. Then..more size, more fish...added a 275gallon side flow filter. Again..all was well. My point is your filtration should be dynamic...add more if needed(..or reduce fish load). Manufacturers recommendations mean little...to say it's made for 5,000gal...well, 20koi, 30koi or 50koi? I put my stock in testing my water and adapting as needed!!! I follow the same formula with fish tanks as well. This method cannot help but be successful. |