Koi winterization/pump/muddly water
Hello Everyone- I am very new to this forum and read a lot of messages before posting here. I got a "old" pond earlier this year with around 25+ fishes and stopped feeding them 1 month now but the bio filter is still on. I am in 6a zone. My questions-
1) I do have a deicer to keep a hole. can I keep the waterfall (bio filter) "on" during the NJ winter. is that deicer enough?
2) If I shut the waterfall -should I take the uv bio filter inside after disconnecting or I can leave it ouside as it is?
3)We had our second snow yesteray (couple of inches) and I see muddy water in the pond- I reduce the water a bit before expecting a rainfall.I am bvues the water from outside is falling in with the snow/rain? What an I do to prevent that?
I would really apprecite help