Hydrochloric Acid is used to lower the pH of water in swimming pools and water parks. Highly concentrated. Corrects pH adjustment and optimises the water quality for efficient disinfection. A pH reading of 7.2-7.6 is required, with 7.2 being the ideal level. 500ml of hydrochloric acid will lower the pH of 50,000ltrs water by five decimal points. eg. 8.0 to 7.5 approximately. Available in 23kg UN-certified drums.