I hope someone can help. I opened my pool today and shocked, and the filter has been running for about eight hours. The water pressure dropped going back into the pool which is normal when I first open it but when I back washed the water in the sight glass remained clear. Usually, the water in the sight glass looks dirty when I backwash, then runs clear, and then I switch to rinse. The water pressure back into the pool is now back to normal but isn't it odd the water ran clear the entire time in the sight glass.