Diffenitly clean out your soleniod valves, you might be surprized at what you'll find inside. I use a 80 mesh strainer on the inlet side of the Procon pump https://www.kleen-ritecorp.com/p-111-smc-clearbowl-inline-strainer-12-f-x-f-80-mesh.aspx I use the same strainer on all of the systems. I also clean out my tanks every 6 months or when they need it.