Recurring clogs in modern construction
When we camera a Lone Tree main and find clean, round, well-graded PVC, the answer lies upstream: a garbage disposal doing work it was never meant to do, wipes, or a kitchen line that has been collecting grease since the house was built.
The disposal is not a trash can
Fibrous scraps, coffee grounds and rice all survive the disposal and settle in the horizontal run beyond it. That is where the plug forms.
One fixture or all of them?
A single slow fixture is a branch line. Multiple fixtures backing up at once is the main, and that distinction decides the whole approach.

