How many times per hour must water from a pond be pumped through its filter?

I have a 9000 litre pond in the making , I bought a 12000 litre filter with a UV bulb incorporated , just to oversizea little....... I am looking for a pump now , would a 6000litre per min be sufficient , I presume this mean that a 6000 litre pump would take 1.5 hours for a full 9000 litres of water through my filter. 6000ltres per hour X 1.5 hours = 9000litres , yes???