There is a lot of discussion around water and coffee milling due to a mill's inefficient water use and potential for downstream pollution from processing wastewater. However, it's not been my experience that there are many practical how-to guides available, but the good folks over at CRS Blue Harvest have been sharing some of their awesome work on rethinking the wet mill. They have a fantastic video here that you should definitely check out! Be sure to scroll down and see their other posts on the topic as well.