The venturi is what causes a the draw of the brine solution. It is located under the round cap behind the electronics. Place the unit on bypass, start a cycle to relieve the pressure and unscrew the cap. I use a small blade flat tip screwdriver to pop the venturi out of place. Hold it up to a light and look down the center. It should be clear of any debris. If not, use something that will not scratch the inside but hard enogh to dislodge the debris. If that is not the problem, a new seal pack may be needed.