I've been looking online as best I can, but cannot seem to find an answer. Our inground pool has a Hayward 4 way flow control valve leading into the filter system. It has 1/2 and 1/2 and Full settings on both Port 1 and Port 2. I've figured out that Port 1 is our skimmer and Port 2 is the main drain, so by process of elimination, 1/2 and 1/2 should be running both. Why would there be a 1/2 and 1/2 setting by each Port though?
I'm guessing I need to be running the system set to 1/2 and 1/2, switching to full Port 1 when I vacuum. Is that correct?