Mechanical and biological filtration purified water. Easy to install above or below ground level and very easy to maintain. Featuring Powerclenz - the patented automatic cleaning system, by twisting a knob the filter foam is squeezed for optimal cleaning. Supplied with Fish Mate SUPRA+ biological filter media. Suitable for ponds from 750 to 3000 gallons. Multi-sized inlet and outlet are adaptable to 3/4", 1", or 1-1/4" flexible hose. Hoses and hose clamps are not included. Inlet - Outlet PVC pipe thread is BPT (British Pipe Thread) not NPT.