I am looking into the issue of a sag in a 6" diameter drain line that is buried about 7 feet below the basement floor slab which is a structural suspended slab due to poor soil. The pipe is suspended from the floor slab. The pipe clogged up about 3 months ago, but was snaked out and has been running freely to date. However when the plumber videoed the pipe at the time, he discovered that there was a sag in it, such that the pipe was always full of water for about a 10 foot length. There is a trap in the line just before it exits the building. Due to the structural slab, it is costly do get down to the pipe.
Question: Is there any problem with having a sag in the pipe? Does it have to be fixed? Or is it ok to monitor it and see if it clogs again?
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