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n.  in astronomy, a constellation of the Southern Hemisphere. Lies due south of the bright star Achernar in Eridanus. A south circumpolar constellation that terminates within a few degrees of the south celestial pole. Etymology: Hydrus Latin, from Greek hudros, the water snake was the primeval god of fresh water.

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n.   A lightweight, robust, non-metallic, multi-port valve with advanced engineering for more efficient and effective ion exchange, water softening and filtration operations. - see also; better water quality, less salt, higher flow rates.