Belly or less than normal slope?

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lawwatchscotch

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Getting my basement finished and had my sewer line cameraed to get ahead of any issues. It's 4 inch PVC under slab installed in 2020 by a company I no longer have confidence in. The camera identified a belly in a section of the pipe that was holding water and submerged the camera, but minimal waste. Plumber initially said not to fix it, but I'm worried about it causing a problem later and having to rip out a portion of the newly finished basement.

It's accessible and easy to get to now, if it's worth it. We excavated the nearest fittings to get depths and determined that there's space to create roughly 1 inch of fall over that 20 foot section, which is under the 1/4 code requirement.

Will that relatively minimal fall be better than the belly such that it makes sense to fix? The plumber is the plumber doing my basement and I trust him - he's also doing it at a cut rate so the expense isn't an issue.
 
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