You do not say from what depth or from which reservoir you suck the water, but, a centrifugal pump does not have the capacity to "suck" from a great depth, one of 1/2 Hp. not much more than 4 meters, at most! Therefore, even if you change the pipes, seals, cables, and pray to the saints of the deep waters, you hardly have a solution, without counting on the resistance to the passage of water they offer, fine pipes, curves, elbows, "T" and stopcocks and everything else. luck