I opened my pool on Sunday, and had it clear in a few hours... a little CYA, calcium, muratic acid and baking soda later, and I am all my numbers are ready to turn on my SWC.... don't you know I slide the button to on... and I get NO FLOW.... so I stop my pump and remove the flow switch, and check it out... looks good to me, reinstall and still no flow... so I call the 800 #. They immediately told me I needed a new flow switch... this is 4th season for pool, so it's still under warranty... so it's $50... and its in the mail. But what I did learn was while we removed so much during winterization... for some stupid reason, we left the flow switch in place... and that cold/snow freeze isn't apparently good for the phone wire on the flow switch... so I have learned... remove the flow switch.... THanks for listening.. its back to bleach until the new one arrives...