During pumping, maintain consistent vacuum, prevent tank wall damage, break up heavy solids with agitation

https://sierra-wiki.win/index.php/Hydro-Jetting_vs_Typical_Sewage-disposal_Tank_Cleaning:_When_and_also_Why_to_Use_Each

Throughout pumping, maintain consistent vacuum, avoid tank wall damage, break up heavy solids with agitation, and never ever enter the tank; deadly gases need strict confined-space safety protocols.