I plan to have a tank which is around 7m below the pump, and the water level of the tank would be around 3.2m which could cut short the suction head, which i think woulnd't be any help as i would need to suck all the water out from the tank down to the bottom.

Is there any ways that i could make it happen? Any changes could be done, except the 7m vertical distance, or atleast 4m.

Hope to hear a reply soon. thanks in advance though.

Best regards,
Michael