You are 6b per climate zone, same as me.
I don't worry about debris, just herons. So I use a wide weave net high above the
pond surface. Just net out anything that
falls in. Keeps the other critters safe. I don't add any chemicals to our pond.
On my phone a little hard to type back.
Yeah, many years ago, literally days after I bought a large number of koi, a heron came by and had an expensive sushi meal. I don't know how he got them, but he did. We saw him out there. He left us with only 6 and they hid for weeks! I did not think we had any left. I was so very happy to have some left.
As you might be able to see in the photos, there is fishing line strung on bamboo poles around the pond to deter herons. We did that before the new net arrived.
The water is below 53F, so we have stopped feeding the fish. We run the pumps and waterfalls year round have have a heater so that a hole is kept in the ice. Things look a little rough right now. I need to tidy it up when I can.


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