Recirculating systems are closed, or semi-closed, aquaculture systems in which most of the water is recycled through the system and very little is discharged. Water that would otherwise be discharged with wastes is treated and reused within the system. Recirculating systems limit other environmental impacts, such as escapes and disease interactions [..]

A domestic or service hot water distribution system that includes a closed circulation circuit designed to maintain usage temperatures in hot water pipes near terminal devices (e.g., lavatory faucets, [..]