Innovative flow-through filter design provides maximum oxygenation. BioSmart UVC 5000 is suitable for ponds up to 5000 gallons. High-surface area filter foams provide exceptional biological filtration capability. Distinct filter zones promote the settlement of a variety of beneficial bacterial responsible for different phases of the nitrogen cycle which increases the conversion of harmful ammonia in your pond. Advance features include the built-in cleaning indicator notifies you when the filter needs cleaned and water temperature display tells you the water temperature at all times. Cleaning handles for convenient maintenance allow for easy cleaning without needing to remove or manually unclog the filter foams. After clearing the filter foams the sludge drain can be opened for easy removal of coarse debris from the unit. Supports 34 1 1-14 1-12-in tubbing for the inlet 2-34-in tubbing for the outlet and 2-in tubing for the drain. For best results and clear water guaranteed use with an appropriately sized OASE pump and UV clarifier.