Description Welson GCL is a powdered precipitant, specially formulated for the turbidity of the pool water, which can make the pool water clearer. Dosage Adding 15 kg of GCL per thousand cubic meters can achieve the ideal precipitation effect. After first dissolving WELSON GCL in water, the solution can be put into the pool evenly, and after 6-8 hours, the substances deposited at the bottom of the pool are drawn out. Alkalinity of 75mg/liter (CaCO3) is ideal, the use of WELSON GCL will reduce the pH, so adjust the pH to 7.6-8.0. Safety Irritating to eyes. In case of contact with eyes, rinse immediately with plenty of water and seek medical attention immediately