You can order pressure test plugs to replace the nozzles on that circuit in the pool so there will be no leak from those nozzles.Note: the water valve will also have to be addressed so it will not dead nozzle (stop, have very high pressure, and damage pool equipment) at the blocked circuit.  There are two ways to do this.
Cut the line going to that circuit and tee it into another line. A cap should be placed over the line going to the pool and the line coming from the valve is tied into another line.
Cut and cap the line that is blocked below the valve shell. Then cut the vein separating the ports inside the water valve base from that port to the port clockwise for it. A cap should be placed over the line going to the pool.