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Uploaded on May 6, 2008
Cal Spas Hot Tubs, Spas and Swim Spas for Sale. ABC Family's Knock First. Knock First is a lightning fast, half-hour, do-it-yourself show where contestants transform their outdated rooms into kickin' pads. The magic happens when a Cal Spas octagon spa brings out the flavor in this house. Visit us at http://www.calspas.com.