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FSP are floating scum skimmers designed for the collection of floating scum in the treatment of wastewater. They consist of a submersible pump, jet-injector mechanism and three floats. The jet-injector mechanism ensures stable suction operation even if water, air and scum are drawn simultaneously. The floats enable the submersible pump’s inlet to remain in a constant position on the water surface, which prevents operational failure during changes in the water level. The inlet can be adjusted to a depth of between