HTH 91917 Pool Care Kit, 2 by 1-Inch For Opening & Closing your pool Treats up to 20,000 gallons of pool water Contains HTH Algae Guard (1-12 oz.), HTH Shock 'N Swim (2 - 1lb), HTH Metal Control Granular (1-1.25lb) & HTH 6-Way Test Strips (10 count)