Its not easy to burn waste oil. Same as burning heavy fuel oil. It takes a lot of TLC to make it work. But when it works, its great!
To be honest, this is my first time.
Over here, they burn the waste oil straight without filtering, which is good for the traders who are selling the pumps
BTW, do you only work on Bentone burners ( GREAT burners very popular here ) or do you also work on other brands like weishaupt, riello, baltur, etc...?