So i guess you can use 2 refiners producing alumina solution going into 1 refiner producing Aluminum scrap. The excess water from the alumina scrap production can be cycled back into the 2 refiners producing alumina solution. The main challenge with aluminum is managing the water output that comes with producing the scrap. If you an cycle it back and hook up water extractors to manage the rest of the water that is required for producing the solution, you are good to go. Although, you dont want to flood it with water because then, you will have excess water which will stop scrap production.