In The Swim Basic Pool Opening Chemical Start Up Kit - Up to 7, 500 Gallons Formulated, pre-measured kits contain essential spring startup chemicals for pools up 7,500 gallons Chlorine shock eradicates bacteria and other contaminants Stain, rust and scale preventer removes mineral staining and scale Non-Metallic algaecide kills algae while the clarifier enhances filter performance Test strips measure free chlorine, pH, total alkalinity, and cyanuric acid (stabilizer)