Frozen bog


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Also Lisak1, the woman at the garden center where I purchased the pump said to turn it off anytime it got to 18 degrees. I was afraid the pump would freeze up. The pond never froze much so I guess the other pump to the bog would have been fine too.
 
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The magical 18 degrees, huh? That number literally means nothing without knowing your full pond set up. Exposed plumbing, where's the pump, how deep is the pond, how much water volume, how is the bog constructed... I could go on and on. If you want useful answers we need real details on your particular pond.

As a sidebar - people at garden centers are not pond people even though they sell pond stuff. If they build ponds, if they have a pond - cool. Otherwise they are just another retailer selling you a product that they probably know little to nothing about. Or a high school kid who needed a summer job.
 
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When you turn off your pump feeding the bog, the water, due to a vacuum, will all get sucked back into the pond and empty the bog.

You can see this in action if you turn off your pump and pull it out of the water. You will see the water reverse flow, coming out of the pump's intake.

To prevent this you need some sort of a vacuum break. The easiest way is to shut the pump and open the pipe at its highest point to break the vacuum. You can use a union in that section of the PVC pipe. Turn the pump off and open the union to break the vacuum.

Some people have installed a check valve or a dedicated vacuum break to prevent this, but those devices can fail due to clogging.
Some people drill a (permanent) small hole (within the bog) in the pipe feeding the bog. This will break the vacuum without any input from you.
 
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Thanks for all the expert advice! I plugged in the pump and the bog is flowing fine. The weather is going to be nice this week, so hopefully I can deal with the issues.
 
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Thanks for all the expert advice! I plugged in the pump and the bog is flowing fine. The weather is going to be nice this week, so hopefully I can deal with the issues.
If you decide to shut it down when it gets cold again, try to break the vacuum immediately after you shut the pump off. This way the water in your bog doesn't reverse flow and the bog won't drain down.

If you have hardy plants in the bog, they need the water even if it freezes solid, or they will dry out and die.
 

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