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

https://fair-wiki.win/index.php/Reliable_Septic_System_Emptying_and_Installation:_Smart,_Cost-Saving_Methods

Procedure sludge and residue with a sludge judge to validate pumping need, then mix contents gently to suspend solids so the vacuum truck gets rid of both layers, preventing blockages and premature refilling.