Patent ID: 7351331

Claim:
A recreational portable spa, comprising: a recreational spa water reservoir for containing a bromide salt dissolved in water; a recirculating system for removing and returning the water from and to the spa water reservoir, the recirculating system comprising a circulation pump, a passageway, and a filter; an electrical power unit; a housing comprising inlet and outlet openings operatively associated with the passageway for permitting the passage of water containing the bromide salt into the housing and water containing free bromine out of the housing, respectively; and first and second electrodes electrically connected to the electrical power unit and having first and second contact regions, respectively, in the housing for contacting water passing through the housing and converting the bromide salt to the free bromine, at least one of the first and second contact regions being made of non-woven extruded graphite having a permeability equal to or less than 0.14 darcy's and a porosity equal to or less than 21%.