I was just wondering why the Pool School Recommendation for CH is so much different for Bleach vs. SWG for plaster pools? It's basically the same for other pool types, but pretty different for plaster pools (250-350 for bleach vs. 350-450 for swg). My pool is in enclosure and adjust the target CYA due to it being not directly in sunlight due to UV filtering of screening, I didn't know if screening would make a difference with target levels for CH. Just trying to understand why so I can do a good job of maintaining my pool.