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

https://delta-wiki.win/index.php/Selecting_a_Specialist_for_Septic_System_Pumping_and_Cleaning_on_a_Spending_plan

Procedure sludge and scum with a sludge judge to validate pumping requirement, then blend contents gently to suspend solids so the vacuum truck gets rid of both layers, avoiding obstructions and early refilling.