Wastewater is pumped through treatment systems that clean and re-filter circulated water before returning it to the fish tanks. These recirculating systems can be built on land, allowing farming to take place all across the country. Compared to other raceways, RAS aquaculture has less wastewater and overall water requirements. This type of farming also eliminates risks associated with environmental harm to ocean habitats. A wide variety of species grows well in these tanks such as arctic char, salmon, trout, bass, and sturgeon.