Not strong at all theoretically speaking. All you have to do is have enough headroom to pump higher than water level for a given diameter of pipe and have an ai

Not strong at all theoretically speaking. All you have to do is have enough headroom to pump higher than water level for a given diameter of pipe and have an air intake to match which is higher than water level. You could take forever with a strong pond pump and achieve the same effect. I designed full-building hydroponics systems. You get similar issues with things like vacuum pressure in tanks causing your pumps to not work properly.