Sizing ejector pump

[nnis69]

Our basement has an ejector pit/pump and I'm assuming the pump is original at 15 years. It's starting to short cycle, on for a few second and then off for a 15 or so. The short cycling is especially noticeable when draining the tub. I can stick a claw grabber through the wire grommet, pull the lever float up and the pump runs fines, is just as quiet as it was from the day we moved in so I'm guessing the issue is probably the automatic float switch. But being 15 years old, I'm guessing I should just replace the pump even though the bathroom rarely gets used

Anyway, I have no idea how to size a replacement pump. I know the current pump is a Zoeller but unsure of the model. Currently the pump is used for a full bathroom with a tub. When we do finish the basement, I'd like to add a bar sink. There's maybe 10 ft of head (from where the pump sits in the pit to where it terminates to the sewer line in the ceiling) How many gpm should I aim for?

 

[Breplum]

Pump Sizing Program

It’s important to ensure you select the appropriate pump for your application based on performance and electrical requirements. Zoeller’s pump sizing program can help!

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[Reach4]

I wonder if a new float would fix it. https://www.supplyhouse.com/Zoeller-034019-Plastic-Float-for-267-0050-Waste-Mate-Sewage-Pump

 

[nnis69]

I wonder if a new float would fix it. https://www.supplyhouse.com/Zoeller-034019-Plastic-Float-for-267-0050-Waste-Mate-Sewage-Pump

Maybe?! It will occasionally run as I'd expect, on for maybe 30 seconds and then off for a while meaning the pit mostly drained.

What would cause the float to fail? The switch I could understand but I'm not sure about the plastic float. Do they become waterlogged?

 

[Reach4]

What would cause the float to fail? The switch I could understand but I'm not sure about the plastic float. Do they become waterlogged?

I have wondered why they sell replacement floats. Since they do, I suspect they can become waterlogged.

But they also sell replacement switches. https://www.acehardware.com/departments/plumbing/pumps-and-pump-parts/pump-repair-parts/4019919 Of course you would want to know what pump you have before ordering parts.