All of the priming and vacuum issues they describe is why I swear by submersible pumps. I use a pair of deep well pumps to move water up 70m, each doing a 35m l

All of the priming and vacuum issues they describe is why I swear by submersible pumps. I use a pair of deep well pumps to move water up 70m, each doing a 35m lift, with a relay tank halfway.