This Bundle has THREE items: the OASE BioMaster Thermo 850 Canister Filter w/ Heater; the OASE Clear Tronic 7W UV Clarifier; & a MarineAndReef Towel. The OASE BioMaster Thermo 850 Canister Filter is perfect for marine and freshwater aquariums. The BioMaster 850 boasts 4-stage filtration in a compact design. The biological, mechanical, chemical, and prefiltration all work together to provide your aquarium with optimal water quality and clarity. It features a built in 400 watt heater. The OASE Clear Tronic 7W UV Clarifier works to promote clear water and healthy fish in your fresh or marine water aquarium. It reduces free floating algae and cloudy water, and it prevents disease that can affect aquarium inhabitants. To use the filter and UV together, just connect the ClearTronic UV to the outlet hose of the BioMaster. The EasyClean prefilter module can be removed separately from the rest of the filter for simple cleaning and to extend the life of your filter. Filter Dimensions: 9.4" x 9.4" x 22.0" Tall. For external installation. Suitable for aquariums up to 225 gallons. The MarineAndReef Aquarium Cleaning Towel is a durable, lint-free microfiber towel. 19" X 15".