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

https://wool-wiki.win/index.php/Dependable_Septic_System_Emptying_and_Setup:_Smart,_Cost-Saving_Techniques

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