Procedure sludge and scum with a sludge judge to confirm pumping requirement

https://wiki-cable.win/index.php/Hydro-Jetting_vs_Typical_Septic_System_Cleaning:_When_and_also_Why_to_Make_use_of_Each

Procedure sludge and residue with a sludge judge to confirm pumping requirement, then mix contents gently to suspend solids so the vacuum truck eliminates both layers, preventing obstructions and premature refilling.