I am not a plumber but I did all my own plumbing when I built my house. ISTR the inspector mentioning that there was an ideal slope, that too much slope would separate the solid from the liquid. It might be a regional thing and/or fluid dynamics work different this far North.1/4" per foot is the minimum, there is no maximum.
I won't say BS to your device, but I will say I am highly doubtful that you can "unglue" a solvent welded PVC, ABS, or CPVC joint. The process of solvent welding melts the surfaces of both the pipe and the fitting and these mix or flow together when the joint is made and effectively make the weld.
Info on tool.hi i have a tool that will unglue any pvc ,abs,cpvc , pipe .it is made by debonding systems spokane wa
This is awkward, but...
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