[Zogthetroll]

kinda off-topic, but what the heck. clorine isn't gonna harm a standard septic tank, reason being they don't have the helpfull bacteria that eat/break up solids in the system. and a standard septic tank needs to have chemicals added to it to kill off the really nasty bugs in human waste. now an aeration (aka biojet or similar) system has the helpful bacteria in it, these would benifit from yeast food, and these systems are the ones you need to be careful about using bleach in the washer. you may still need to add clorine to these systems depending on where it dumps to, but it'll be a seperate tank/compartment AFTER the main tank. anyway, my $0.02