How to clean paint rollers with a septic system?
It’s probably not a great idea: Latex paint brushes, when washed into your septic system will result in large rubber-like floating masses, clogging your system …but to be honest, I’ve done it occasionally, and our house hasn’t fallen down or filled with sewage or anything (and they didn’t mention finding any clogs last time it was pumped out.) Small quantities are probably okay; a fair compromise might be to wash your brushes (after squeezing as much paint out of them as possible) but not your rollers — just reuse those while you’re working, as sully suggests, then don’t bother washing them out at the end; just let them dry solid.
