We suck water for the plants from our fish pond and the pump is approximately 1.5m above the water surface.
Initially, the intake pipe came out at the pump level and there was one 90 degree elbow on it which then went into the water.
Recently, I changed the intake pipe, for reasons I won't bore you with, so that there are now 2 x 90 degree elbows and a further elbow (45 or 60 degree, not sure) which then dips into the water.
Neighbour and my missus are both telling me that the initial vertical in take was better than my new way, but neither of them can explain why.
Honestly, I don't notice any difference when watering. This leads me to wonder if the less bends in the intake pipe is, in fact, the better option. Any thoughts on that?