How to Make a Laundry Water Recycler (Gray Water System) "The idea is very simple: Save the rinse water from one load of laundry in a tank and use that water to wash the next load, cutting the amount of water you use for laundry by 50%. By the way, this idea has been patented, but I don't think any commercial products using it have been made (a commenter corrected me on this)." Vomit Stinky!!!! Not just a little stinky... Imagine this in a college dorm washing room... STINKY!!!!! http://www.instructables.com/id/How-to-Make-a-Laundry-Water-Recycler-Gray-Water-S/ This is like the 'last in, first out' Inventory Management. Selling from the rear.. Selling the bad first, then the good. "LIFO (last in, first out) isn't a good indicator of ending inventory value, because the leftover inventory might be extremely old and, perhaps, obsolete," Melwani said. https://www.businessnewsdaily.com/5514-fifo-lifo-differences.html
Air Filtration systems in large buildings also use such management procedures... Recycling indoor air helps save on new air being circulated. i think some people have jumped off buildings because of these 'recycling' systems.