Up flush toilet problem

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Fmkehoe

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Mar 20, 2017
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HI all,
I have a flush up toilet in our basement. It sits on top of the tank, with the junk getting pumped out thru one pipe, and a vent to atmosphere thru another, with a check valve.
This has worked great for 7years, and boom, all of the sudden, water getting sacked out with the flush. The water fills all the way up, then slowly drains all the way out.
I'm guessing a clogged vent, ( snaked bowl, no clog)
Any ideas or suggestions?
The vent goes outside the foundation and is not screened, maybe a mouse or Three?

Thanks
 
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