So every couple months I clean my resin contaminated alcohol using alum powder (link to a video about the process)
After cleaning it I let it sit in the settling containers until I need to clean my alcohol again. At which point I swap the alcohol that was cleaned into my main wash and cure station tub and then put the dirty alcohol into the other tub I use exclusively for cleaning the alcohol.
Edit: For those curious I can share an image of what the alcohol looks like after it’s had 24 hours to settle in the settling containers.
No idea unfortunately, I typically only print a few build plates of models a week and then it’s a few months between cleanings like this