what can the waste water (from water wash) be used for ? can i use it to make soap or anything ?
waste water is the biggest issue with water washing imo. you could collect it, add acid and recover the ffa/methyl esters. if using koh, the water can then be used as fertilizer for your lawn. i guess most city folk pour it in the sewer.
Should I be concerned about pouring KOH based wash water on the ground?
I have been doing this long enough that I could look into dry washing
Found some useful info: