Description Welson Cu is blue crystallization or powder, dissolving readily in water. This product is formulated for use to remove insect, green moss, algae and prevent microorganism growth in the pools. It also can makes the pool water much brighter than before. When using this product, pay attention to the alkalinity of the water, which cannot exceed 200ppm, and the ideal range is pH7.2-7.8. At the same time, if the chlorine content in the water is too high, copper chloride will form and precipitate on the bottom of the pool to form a black color. Dosage According to the dosage of 2-3 kg per thousand cubic meters of water, good algae killing effect can be achieved. After the medicament is put into the container to dissolve, then the medicament pump is added or directly sprinkled into the pool. Safety Irritating to eyes. In case of contact with eyes, rinse immediately with plenty of water and seek medical attention immediately