I live in Central NY, near Syracuse, and was wondering what a good CYA level is for me. My CYA has been a bit high, 60-70ppm, and I've been whittling it down during the summer (the 2.5" of rain we had this morning should help.) We have a solar cover, and sunshine is at a premium here. I use bleach as a chlorine source, and test with the TF-100. Thanks in advance.