Traditionally, salmon (Salmo salar) smolt have been reared in landbased facilities using water from nearby rivers or lakes which flow through the production site. Flow-through farms (FT farms) depend on high water quality from the source, as means of regulating different water parameters are limited (Kristensen, Åtland, Rosten, Urke, & Rosseland, 2009). Recirculating aquaculture system (RAS) technology has developed rapidly over the last years and has been preferred in new production facilities for rearing of salmon in the freshwater stage. Because RAS technology allows close to 100% recirculation of water, it is possible to produce more fish with restricted resources (Dalsgaard et al., 2013). However, reuse of water demands efficient handling of accumulating waste products, such as particles, which