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 straight to 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 helix 5 w max comes with 2 meter cable and a crossbow Electronic rubber pond and freshwater aquariums and saltwater. For freshwater aquariums from 250 to 500 liters. For saltwater aquariums from1 25 to 250 liters.