Procedure sludge and scum with a sludge judge to verify pumping need

https://wiki-wire.win/index.php/DIY_Prep_and_also_Pro_Tips_for_Suitable_Septic_Tank_Pumping_as_well_as_Post-Service_Treatment

Measure 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, avoiding blockages and early refilling.