Originally Posted by
agarose2000
But is simple green + drivetrain oil & grease safe to discard into the sewer?
Don't dispose of it in a storm drain or sewer that leads to a body of water untreated.
I dispose of my dirty Simple Green mixtures into the sanitary sewer (typical household drain). I know dilution is not the solution, but I doubt the quantities will harm the local sewage treatment plant. One of their concerns is killing off the bacteria they used to process sewage. I am sure nastier stuff is poured down the drain, like bleach which will probably kill bacteria in relatively low concentrations.
I am not sure of disposing into a septic system, and its effect on the bacteria.