Description Pump Filter Combo 600mm Sand Filter (With 1HP Pump) Diameter:600mm – 1.5 inch 250kpa max working pressure. 6 way dial valve including filtration, backwash, rinse, waste, recirculate, closed. Corrosion-proof and UV-resistant body. Underdrain with side-slotted laterals draws water evenly across the full diameter of the sand bed for higher flow, better filtration, longer cycles and more efficient backwashing. Standard pump and firm filter base, easy to install and service Suitable for pools of all types and sizes