The OASE BioSmart Gravity Filter is a flow-through bio-mechanical filter that cleans pond water using multiple filter zones and beneficial bacteria. Water returns to the pond by gravity, making it ideal for installations where the filter sits above pond level. Key Features: Easy-Clean system with cleaning handles—no need to remove foams Cleaning indicator alerts when maintenance is needed Sludge valve with Gardena-style fitting for quick rinsing Three types of high-surface area filter foams for superior biological filtration Built-in thermometer monitors water temperature Venturi inlets for optional aeration Pre-drilled UVC attachment inlets Qualifies for OASE Clear Water Guarantee with proper pump and UVC 3-year warranty Two Models Available: BioSmart 5000 - For ponds up to 5,000 gallons Max flow: 1,450 GPH Light fish load: Up to 5,000 gallons Medium fish load: Up to 2,500 gallons Heavy fish load: Up to 1,250 gallons Outlet: 3" (Schedule 40) Hose size: 0.75" to 1.5" Dimensions: 22" L × 22" W × 16" H Compatible with: Vitronic 18 UVC, AquaMax Eco Classic 1900, AquaMax Eco Premium 2500 BioSmart 10000 - For ponds up to 10,000 gallons Light fish load: Up to 10,000 gallons Medium fish load: Up to 5,000 gallons Heavy fish load: Up to 2,500 gallons Compatible with: Vitronic 36 UVC, AquaMax Eco Premium 3500, AquaMax Eco Classic 2700 What's Included: BioSmart filter unit with cleaning handles Three types of filter foams 3" Schedule 40 outlet adapter Metric step fittings BioSmart Gravity Filter Manual Note: UVC clarifier and pump sold separately. Frequently Asked Questions Q: How does the Easy-Clean system work?A: When the cleaning indicator alerts you, simply pull up on the cleaning handles to squeeze debris from the filter foams—no need to remove them or get your hands dirty. Then attach a hose to the Gardena-style fitting, open the sludge valve, and rinse the filter. The entire cleaning process takes just a few minutes and is much easier than traditional filters. Q: What's the difference between a gravity filter and a pressure filter?A: A gravity filter sits above pond level and water returns to the pond by gravity (flowing downhill). This design allows for easy cleaning and maintenance. Pressure filters are sealed units that can be installed below pond level or buried. BioSmart gravity filters are ideal when you can position the filter above the pond, such as next to a waterfall or stream. Q: Do I need to add a UVC clarifier?A: While the BioSmart provides excellent mechanical and biological filtration, adding a compatible Vitronic UVC clarifier (sold separately) eliminates green water and controls algae. When paired with the proper pump and UVC, the BioSmart qualifies for OASE's Clear Water Guarantee. For the BioSmart 5000, use the Vitronic 18 UVC. For the BioSmart 10000, use the Vitronic 36 UVC.
