SeaClear Chillers are manufactured in the Flo-Thru style. Using either your existing pump, or an additional pump, water is circulated through the chiller, cooled, and returned to your aquarium or filter system. A Flo-Thru Chiller installs just like an In-Line UV sterilizer. All models are safe for use in saltwater or freshwater and are complete with an LCD Digital Thermometer, Temperature Controller, and a 1 year warranty.