Step sludge and residue with a sludge judge to confirm pumping requirement

https://juliet-wiki.win/index.php/Trusted_Sewage-disposal_Tank_Emptying:_What_to_Get_Out_Of_Professional_Teams

Step sludge and scum with a sludge judge to verify pumping need, then blend contents carefully to suspend solids so the vacuum truck gets rid of both layers, preventing obstructions and early refilling.