I need help bad. I've been having constant problems with check valves on my Flojet pump on my Low Vol sprayer. I've tried to troubleshoot it as best I can but haven't really been able to figure it out. I think now that the problem may be with some of my products. I know that the Pendulum 3.3 is hard on pumps so I switched to Aquacap. I think now that maybe the suspended ingredient may be screwing up the check valves. Has anyone used Pendulum Aquacap, Pendulum (Pre M), or Simazine regularly with a Flowjet or Shurflow pump and if so, have you had problems.