Built specifically with userexperience, maintenance,and installation in mind, the Classic series is compact and lightweight. But don't let the size and weight fool you –these units are still extremely effective in cleaning and decontaminating water using the latest and greatest UV sterilization technology. Also called UV light water treatment, UV sterilization is a physical process that eliminates germs and bacteria fromwaterusing specially concentrated rays rather than chemicals. The result is completely clean water that remains unchanged in its chemistry, taste, smell, and pH. The Classic series has been designed to maximize the effectiveness of this process so you can have peace of mind that the water in your aquarium, pond, and any other water feature is clean.