I just got a house with a pool and I think I have my water flow turn on right but I’m not totally sure. Can someone clarify? All the way to the right the two pipes coming up are marked skimmer, the middle pipe coming up is marked drain the one left of that marked return. To the left, out of pic, is just a heater. The pipe that comes up higher all the way to right is unmarked but that small filter reads as no pressure. But it’s got water flowing and it’s filtering lots of small stuff. Any help appreciated