DuraPro Technology - Edge coating. A harsh environment calls for parts that can withstand the elements. Add DuraPro - Kuul's proprietary edge coating technology - to your Kuul vitaliity evaporative media to add an additonal layer of durability to an already tough product. When applied, DuraPro extends the life of your evaporative media in demanding environments and allows for easier cleaning with less damage to the outward facing edge of the media. The dark color of DuraPro coating prevents light from entering the media and reduces the growth of algae. When used on the bottom edge of evaporative media, DuraPro prevents the media from dissolving due to constant contact with water.