Antibacterial hand soaps and any product claiming to be antibacterial should be avoided, not only because of the obvious harm they could do to the bacterial colony your septic system needs to function, but they are now being linked to the development of “superbugs” that are antibiotic resistant and pose a health risk to us all. Good old soap and water works fine.
Not only do the antibacterial chemicals in automatic toilet cleaners kill the bacteria in your toilet, they also kill the bacteria in your septic tank. If you use these toilet cleaners, you may find yourself ending up with a septic tank full of blue water and a lot of dead bacteria. Cleaning the toilet instead with a combination of baking soda and white vinegar will give you equally effective frothy results that are nontoxic.