so i bought a Maxijet 600 and a Phosban 150 for the tank. when i hooked them up together, there's a noise coming from the pump. i then tested the pump by removing it from the hose and the noise is gone. it only happens when the connections are made. therefore i conclude that the noise is caused by the backflow of water as the result of the ball valve. does anyone has a similar issue? how should i approach this issue?