Originally Posted by
Harold_4074
A point that is not often made is that the effectiveness of a septic tank is a function of the "residence time", which is roughly the ratio of tank capacity to inflow rate. A quick Google search suggests that something like two days is a common design rule, so a 1000-gallon septic tank would be good for no more than 500 gallons per day. An archival print washer might run at 1/2 gallons per minute, or 30 gallons per hour; one wash cycle per day would correspond to about one luxurious hot shower per day, However, if the washer an continuously for six or eight hours, the impact on the septic system would not be trivial.
If prints are thoroughly rinsed first, print wash water contains negligible amounts of chemicals of any kind, and probably should be used for irrigation.
Bookmarks