Helix Max UV Sterilizer eliminates algae and keeps the water crystal in the aquarium and ponds. Helps control bacteria and other parasites and the risk of infection among fish. The water flow controlled from the helix and the large volume max ensures maximum efficiency. The water goes into a spiral directly into a quartz tube with a long contact time. Because of this, UV radiation is used most efficiently. The inlet and outlet max helix can be rotated through 360 º, this space saving and ease of installation. The sterilizer 36 w max helix comes with 10 feet of wire Electronic rubber spring ponds and aquariums for freshwater and saltwater. For freshwater aquariums from 1,000 to 2,000 liters. For saltwater aquariums from 500 to 1000 liters. For ponds of36,000 liters.