Tetra Bio-Active Pressure Filter 4000 UV 18watt

Very heavy duty filters. Unique open-profile media that provides a large surface area for beneficial bacteria. As well, it allows unrestricted waterflow to all surfaces for improved cleaning. Back flushes quickly for easy cleaning. Replacement bio-media available.
Maximum Pond Volume: 4000 gallons
Recommended Pump: Oase Aquamax Eco Classic 3600
Recommended Hose: 1 1/4" - 1 1/2"
2 year warranty