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the reason you are encountering a quantity of sewage/water when you attempt to remove the check valve, is because it's doing its job, preventing the effluent-just-pumped from returning to the pit, traveling back down the 'stack' (vertical pipe) at the moment of pump deactivation.
Unplug the pump and loosen the band (coupling hose-clamp) partially to let it drain. Installing a literal 2-inch PVC ball valve immediately down-stream from the check valve on the discharge line will eliminate this issue in the future, if you have a new pump/check installed.
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