This is Pool buddy. The only agent that prevents the formation of a slippery layer in the pool. This patented water maintenance product, in conjunction with chlorine, is guaranteed to keep the pool 100% clean and safe. Pool buddy also makes the chlorine last longer, not only saving the environment, but also preventing that familiar pungent chlorine smell. So this also ensures less irritation of mucous membranes and airways. 1 bag per week per 2,000 liters is sufficient. Features: Prevents slippery coating in pool Extends the life of chlorine 100% clean and safe Specifications: Color: white Packaging material: plastic Dimensions: 8.5 x 13.5 x 0.5 cm (LXBXH) Delivered per bag