Description Welson 511P is a granular fungicide specially used for controlling the growth of algae, fungi and bacteria in the swimming pool, preventing the swimming pool bacteria from exceeding the standard and the water body turning green. This product is easy to use, safe and harmless, and has a good sterilization function with a low dose. Dosage Adding 2-2.5 kg per thousand cubic meters of water will maintain 0.3-0.5 mg/L of free chlorine. Safety This product is an oxidizing agent. Avoid contact with skin, eyes or mucous membranes. Don’t mix with acid products while in use or neutralize agent in case of producing harmful gas. If swallowed, do not induce vomiting. Drink milk or water and seek medical attention immediately