Ultima II 4,000 Bio-Mechanical Filter Valve Inlet/Outlet Sizing:1-1/2" use a pump that will

use a pump that will give you 4000 GPH at your Total Dynamic Head (10’ of pressure head plus vertical head height plus friction head (length and inside diameter size of hose with fittings such as elbows) for the best backwash

2' head: ~3

4' head: ~3

Max Head Pressure: 19 feet

Ultima II 4,000 Bio-Mechanical Filter Valve Inlet/Outlet Sizing:1-1/2" use a pump that willValve Inlet Outlet Sizing: 1 1 2" or 2" To support aquatic life in bodies of water from 2,000 to 4,000 gallons. Optimal Flow Rate Pump Recommendation Min Flow Rate: 2,000 GPH Max Flow Rate: 4,500 GPH Dimensions for 1 1 2" Unit: 20 1 2 Diameter x 38 Tall Dimensions for 2" Unit: 20 1 2 Diameter x 39 3 4 Tall Ultima II 4,000 Bio Mechanical Filter To support aquatic life whether at an aquaculture facility, backyard pond or large aquarium system it is