Plumbing - Air Locks (even more)

So, the goal is to get the air out of the system so that the pump can operate properly.

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No pressure weeks after adding filter. Almost seems like an airlock. Worked with the filters for the first couple filter swaps, but now loses pressure after a filter change. More in comments.

How to Fix Air Lock Problems in the Sewer Line

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How You can Manage with an Airlock in Pipes

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