We just put up the pool (first time pool owner) filled with well water through softener. Looked crystal clear in the beginning, but as pool was about half full, water looking a yellowish green. Put salt in and cyanuric acid but haven't run filter or SWG yet. What would be the best way to start to handle this.. Pool still has about 6 inches or so to go to be full (5455 gal) . Please help.