Magenta Filter for GoPro Dive housing-color correction for green water-GoPro accessory filter Correcting the auto white balance on the GoPro and restoring vibrant colors to underwater videos. Makes for a great filter for dive housing in most freshwater river or lakes preventing green water to appear The filter is easily installed by removing the 10 screws on the lens window and popping the filter in. The Screws do require a special T6 star screwdriver to remove. Satisfaction Guaranteed!