Choose Aqualoon GRE AQ503 filter media, an innovative and eco-friendly solution for your pool. Composed of 100% natural polyethylene balls, 500g of Aqualoon is equivalent to 18kg of sand, with a filtration fineness down to 3µm. This 3-in-1 product includes recycled PET balls: blue balls eliminate bacteria, black balls eliminate odors, and white balls filter the water.