California has banned the use of Happy Camper products which contain certain chemicals. Specifically, these chemicals kill beneficial bacteria which inhibit solid waste from breaking down. The unprocessed solids then pass THROUGH waste treatment facilities without being broken down, which prevents further composting.
Although it may sound offensive to some, I think educating oneself about basic processing of human waste is a necessity... it protects you AND others who are affected by your actions as an RV user.
Your black tank IS NOT a processing center like a residential septic system. Those who have septic systems and wells understand this. Understanding what happens downstream from your "effluent emissions" is key to understanding what is most beneficial for your black tank.
Happy camping!!