Hi, I’ve been battling yellow mustard algae since end of June with a vacation here and there. Never had this stuff before. Read interesting thread from 2007. First, I live in Central NY, home of the perpetual cloud. We do have summer in July and early to mid August. Seems like the Experts live in warm, sunny, pleasant climes! Anyway, I have been testing almost daily. Vacuuming and brushing between rain. We’ve had bad smoke and particulates from the wildfires. Dumping mass quantities of Cl into the pool. SLAM, YelMust SLAM. Repeat. So, reading through this thread, I noted high CYA levels. My CYA is at 40. Should I raise it? Also, 2 days ago, we removed the new this year clear solar blanket, which boasts allowing sun in to warm and keeping that warmth in. No yellow mustard algae. So far Gone! Just gunk at the bottom. Could this be? Of course the temp has fallen to a refreshing 76°. Use Pool Math recommendations. Thanks!