Monitor trap performance with depth measurements of FOG and solids

https://mill-wiki.win/index.php/How_a_Grease_Trap_Companies_Keeps_Restaurants_Compliant_and_Ready_for_Daily_Service_24869

Monitor trap performance with depth measurements of FOG and solids, setting off pump-outs at 25% capability to maintain performance, prevent nasty odors, and meet most local pretreatment requirements.