How to backfill & pour new concrete in a basement floor?

this video explains How to bakfill & pour new concrete in a basement floor?
I used sand/topping mix concrete to get that nice result.

here is a link in case you want to know how to do rough in plumbing in a basement:
https://youtu.be/Hziuf1uAFu4

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Видео How to backfill & pour new concrete in a basement floor? канала Renovation school