Black water deodorizer safe for septic field?

[jodipitbull]

Hi,
I am planning to permanently set up my camper on a vacant property I bought in northern Michigan. I plan to set it up with solar, well for water, and septic field. I understand I need to fill the black water tank and empty it every four days or so, but have also read I can’t put chemicals in there that will kill the septic field bacteria. Does anyone know of any products I can put in the black water tank that will coexist happily in the septic field? Thanks!