Throughout pumping, maintain stable vacuum, prevent tank wall damage, break up heavy solids with agitation

https://kilo-wiki.win/index.php/Septic_System_Pumping_and_Routine_Maintenance:_A_Property_owner%27s_Step-by-Step_Manual

During pumping, maintain constant vacuum, prevent tank wall damage, break up heavy solids with agitation, and never ever get in the tank; deadly gases need strict confined-space security protocols.