Compact, efficient and durable, the Tetratec® UV5 Clarifier cleans and sanitizes the water by reducing the number of free-swimming algae, bacteria, viruses, fungi and the smaller life stages of protozoans. Effective in aquariums up to 100 gallons, the UV5 has a solid quartz sleeve around the UV bulb, thick ABS plastic shell and built-in mounting bracket. The UV5 comes with universal hose fittings that work for 1/2”, 5/8” and 3/4” hose.