I have 2 intake and 2 returns for my pool. One intake(filter basket) has much less flow that the other. Just bought the house in November so this is the first time we are opening it up. Neighbor said he doesn’t think the pool has been opened for 3-4 years. I turned the valve that controls the intakes to all positions. Doesn’t seam to matter if I select only the weaker intake. The flow doesn’t change. Thinking maybe it’s clogged up? Any way to put pressure through it to clear the line? Any suggestions are welcome.