The IceCap PRO Hang On Back Turf Scrubber is a natural water filtration solution designed to control and remove algae from saltwater aquariums by growing it in a controlled environment outside the display tank. This scrubber uses algae's ability to absorb excess nutrients like nitrate and phosphate, effectively cleaning your water without the need for frequent water changes or additional chemical treatments. Measuring 11.3 x 5.3 x 6.7 inches with an included EVO-400 feed pump, it is easy to install directly onto most tank rims up to 80 gallons in size and requires no special plumbing. It features a powerful LED lighting system that promotes robust algae growth on its screen for efficient nutrient removal.