New the the board here. I have a new Gunite Pool with River Rok. My main drain is clogged...most likely in the T between the 2 drains. I'm sure its with the RIver Rok plaster from the installation. My PB came out with a diver today with a failed attempt to push water in both directions to unclog it. This did very little to help. Only a small amount of water will come through when I close my skimmers and will quickly starve my pump. My PB now says its fine and that the pool is not meant to only have main drains open without a skimmer. Any ideas on how I can fix this situation?