Sump pump check valve intermittently sticks open

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MSwol

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Recently moved into a new (well old, house).

There is a primary sump pump running off AC... and a backup secondary sump pump that runs off of a car battery. Each has its own discharge pipe and check valve, which feeds into the main discharge.

Still getting used to a "real" basement.. I don't have a feel for how often a sump pump should run. However, the other day.. it was cycling quite a bit. I put my ear to secondary check valve and could hear water running through it while both pumps were off.

I replaced this check valve... but the issue persisted. I went outside to check where pipe was discharging and it was essentially buried below a puddle.. so I dug a bit of a rut for the water to run into the yard.

I'm now waiting for the issue to pop up again... the issue is intermittent, but when I find it.. I typically run the secondary pump for a few seconds and the problem resolves until next time.

Any thoughts on what I can do to prevent recurrences?
 
As I mentioned in my original post...

Each has its own check valve, which feeds into the main discharge.

The check valve for the main pump is silent as can be..
 

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