Measure sludge and scum with a sludge judge to validate pumping requirement

https://wiki-club.win/index.php/Sewage-disposal_Tank_Emptying_Book_as_well_as_Ideal_Practices_for_Long-Term_System_Health_And_Wellness

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