Recently I had an issue with CYA Being too high. We were using stabilized pucks with cal. Hypo to chlorinate our pool. We were never told by the pool company to drain the pool till it was way too high and our pool was cloudy. Long story short we drained the pool and now CYA is 50. But according to the calculator we need FC to be at 6ppm? Is that way too high to swim in? I read on some sites recommended safe level is 3ppm or 4.