I have a PMUP in my sump that I am hoping to use for water changes. It is connected to 1/4" tubing that runs about 12-13 feet up my wall then goes across my attic (parallel run) then down 12 feet or so to the bathroom drain. The PMUP just hums for a long time and doesn't move water. I have two PMUP's and was hoping the first was defective. However, both are doing the same thing.
I am sure I am missing something. Any suggestions?
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