Package included in: 1 X TelChem Hydrochloric Acid 5L (50040005H) (This item can not be posted. In store only) Features: Reduces the pH in pool water, improves clarity and improves the effectiveness of chlorine. Cleans and etches bricks and concrete. pH Adjustment in Swimming Pools, Brick Cleaning and Concrete Etching, Industrial processes, Mineral Processing, Metal Preparation. Active constituent, 290g/L - 320g/L Hydrogen Chloride.