New to this forum.. I'm having some issues with my pump and vacuum. I'm still learning how everything works. I have a Pentair Clean and Clear Plus cartridge filter, with an Intelliflo 2 VST variable speed pump. I've got an 8k inground pool with a built in vacuum system. I've been using 3000RPM for cleaning, the highest it goes. However, it's not getting all the debri. Dirt tends to just congregate in certain areas instead of being sucked up. I had been using a manual pool vac for a bit to get that, but I just got a hose and vacuum head. I went to use it, but am not getting suction when I put it in the skimmer. There also doesn't seem to be hardly any suction from my skimmer. I don't remember whether I'm supposed to adjust a knob on my filter to make suction come from there. I'm getting pretty frustrated and would appreciate a point in the right direction. Thanks so much!