Went to Leslie's today to get water test since I was in the area. You will see the results in the pic on left. He stated my cya was 200 ppm and I had metals in the water. He suggested first draining below the skimmer or said I could spend $100 in chemicals and try to lower both cya and metals. He also suggested changing the sand as it has not been changed in 8 plus years. I had a bad experience with them in the past (metals, ended up cya locked after following their wrong instructions to a tee). I went home, collected a new sample and decided to travel to the privately owned pool place based on the information Leslie's provided. Local place said they did not find metals (little iron) but did suggest changing sand. (results on right). So ALL that conflicting information lead me here to you resourceful people so I can hopefully get the information needed to get the pool straight. Looks like I also need to invest in a better testing kit too based on reading the information here. In case, my signature doesn't work: vinyl, sand, around 32,000 gallons, city water, pool has been opened all winter, use tablets in the past but haven't used any since December.