Quote Originally Posted by JOSarff View Post
The system is maintained properly and is biologicially active. The major problem in most home darkrooms/septic systems (and it has been discussed elsewhere) is the volume of wash water damaging the biological activity of the tank, not the chemicals. Putting 5 to 600 gallons of waste water from a household a month is not a problem, 200 gallons a day of wash water from the print washer is.
That is the big reason I do not cycle my processing water through my septic. I am less concerned with the chemical issues and more concerned with the waste water dilution issues. I have actually seen this happen with a large family that used their dishwasher and clothes washer a lot. For now I use my process water for irrigation.