Monitor trap efficiency with depth measurements of FOG and solids

https://sierra-wiki.win/index.php/From_Evaluations_to_Pump-Outs:_Grease_Trap_Service_Methods_Restaurants_Rely_On

Screen trap efficiency with depth measurements of FOG and solids, activating pump-outs at 25% capability to maintain effectiveness, prevent nasty odors, and meet most local pretreatment requirements.