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

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

Measure sludge and residue with a sludge judge to verify pumping requirement, then mix contents carefully to suspend solids so the vacuum truck removes both layers, preventing clogs and early refilling.