Rust Resistant: Our composite T-Joint creates a water-tight seal with the pipe, preventing internal rust from forming; the T-Joints are engineered for high strength and infused with UV inhibitor to ensure weather resistance and long service life. Krystal Clear Filtration: The included pump filters 330 GPH and incorporates HydroAeration Technology into the cartridge filter pump providing improved circulation and filtration, improved water clarity, and increased negative ions.