When to turn off filter in winter.

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I have always been confused about when to shut off my filters. I have read that fish need a warmer area on the bottom of the pond in winter to survive. If I run my filter it will circulate the water and make the cold water at the top reach the bottom. Someone please tell me when to turn off my filters. I have a 4 foot deep pond that is 12 feet by 9 feet and live in New Jersey. It gets cold! Please explain what to do I have never found an answer. I have made it through two winters. But last winter it got warm and I had ammonia and lost a fish because I didn’t run the filters in winter. I’m confused and climate change does not help.
 
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mrsclem

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I leave mine running till I get at least 50% of the ponds covered with ice. You can move your pumps up off the bottom of the pond by setting them on a milk crate. I have mine hanging on ropes. Do you have any way to keep a hole open in the ice? Stock tank heater, pond breather?
 
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We run our pond all winter long here in the frigid midwest as do many, many pond owners here. The biggest consideration is whether or not your waterfall can handle the ice that develops without re-directing water out of the pond.

Where is your pump located? If it's in a skimmer box or external to the pond, your fear of affecting the temperature of the water is unfounded. If it sits on the bottom of the pond, like @mrsclem said, just raise it up. At four feet deep your fish will have plenty of warmer water near the bottom.
 
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I turn mine off in mid to late October and plug the air stones in. I turn it back on around the beginning of May.
 
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We tur ours off sometime in late Nov. or ito Dec., just depends on the weather. I like to leave it ruing as log as I can. however our filter will crack if it freezes.

I've been covering my pond in the winter with a pool solar cover for the last few winters. I suspend air stones about 10 inches into the water and run a Pondbreather too.
 
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addy1

water gardener / gold fish and shubunkins
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I turn mine off in November, external pump. Plug in the pond breathers leave the pond to itself until spring.
 

Jhn

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Like Lisak1, I leave my filter running all winter. However, it can’t ice dam and the pump is in a skimmer box.
 
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