The OASE Indoor Aquatics Cleartronic 7W Fish Maintenance Kit helps to create a healthy aquarium environment for your finned friends. It slowly exposes your tank’s water to a 7-watt UV bulb. That UV light helps to eliminate potential fish diseases， algae and cloudiness to create a healthy environment and to give you clear views of your aquarium. The quick release opening feature makes it easy to change the bulb when needed， and the quartz glass bulb enclosure is also easy to clean. A handy indicator light lets you monitor the bulb’s effectiveness without having to open the unit. The kit features a compact design， and you can store it in a base cabinet using the foot plate.