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Old 01-08-2017, 03:03 PM
aravenschild's Avatar
aravenschild aravenschild is offline
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Join Date: Jun 2009
Location: Missouri Zone 6-b
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Frozen filter problems


I have an above ground, somewhat sheltered pond, that holds approximately 900 gallons of water, with another 75 gallons held by the filter, the pump is rated to push 750 gallons per hour, the pond in the ten years I've had it has never had ice more then 4 inch thick in the winter months, but that's not the problem. That would be the filter.........

Just a little information,.......I live in southern Missouri (18 miles from the Arkansas border) zone 6b. We have what are mostly dry cold winters, very little snow, mostly rain, the temperature mainly stays between 20 and 40 degrees, with the temps sometimes going as high as 60 degrees in December. It's those few days in January that get in the single digits that cause the problem I'm having.

Most winters I can leave the pond pump running all the way till spring, it's the single digit nights that cause the problem......

The filter itself freezes shutting off the return pipes, so that it cannot flow back into the pond, and the pump will continue to fill the filter until it overflowes and drains the pond. (Or at least down to where the pump loses suction)

Pond heaters do not work, they only keep a small circle of water open to allow gas exchange. Stock tank heaters can be cost prohibitive.

I'm wondering if I built a box around the filter, insulate it and add a hard top ( and possibly paint it black) if that would solve the freezing and draining problem?

No fish have been lost so far due to the pond draining itself, but let me tell you, it's no fun filling a pond back up in 5 degree weather at 4am so the ice doesn't break loose, fall and rip the liner....

Any and all suggestions welcome.....

And thank you for looking.....

ARC
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