I have an in-ground plaster pool that has two skimmers. The other day I noticed a white pvc line that entered one of the skimmers from the top and protrudes about two inches straight down into the tunnel just behind the weir. I then found a pvc ball valve in an in-ground round irrigation valve box in my pool equipment area that sends water to the skimmer. Is this a common solution for refilling a pool? Is this intended to feed a auto fill system? If so, is there a float valve that will not obstruct the skimmer?
Thanks in advance for your help.