Can't seem to clear my pool water. Had some iron staining and used Stain Free made by Natural Chemistry. Worked great. Waited a week and shocked the pool. Been cloudy ever since. I had the water tested and found phosphate. Used a product to remove that. Still cloudy. Was using a Waterway cartridge filter. Been running it 24x7 for 3 weeks. Still cloudy. Pool dealer gave me a DE filter to try. Been running that for 2 days. Still cloudy. Have tried clarifier. With no luck. The chemistry is perfect. My pool is 35000 gallons. Any help would be great.