But the force is not, to back.
The force always acts in a direction opposite to the force applied to the object (water, in this case.)
Your approach isn't new. Hundreds of people have tried to get around Newton's laws and build a reactionless thruster. So many have tried that there is a page on Wikipedia dedicated to them, in all their various incarnations. None of them have ever worked. No clever arrangement of pumps and turbines will ever generate an action without a reaction.