Often golf courses pump water and circulate to keep the ponds looking nice. A lot of chemicals and fertilizers are used on golf courses. Some remote ponds are irrigation/water make up sources.
I think a few people have created separate tanks for batch treating pond water with PP and then reused for water change. Never seen long term reports how high nitrates get. Possible a planted tank could be used for water conditioning and storage for use as needed. Local fish farm has a water return pond planted with yellow flag iris and cattails. Easier to create a low maintence flow through bog or anoxic filter. Wouldn't have to be 100% of pond flows.
Last edited by batman; 04-24-2021 at 12:55 PM.
The real Batman wears polyester! Don't be fooled by the plastic imposter.