I'm doing a SLAM on my pool and yesterday I added bleach to get it to shock level. After an hour, it was maintaining shock level so I tested again two hours later and it was still maintaining shock level. That was my last reading before bed.
When I tested FC today (not until the afternoon), it had dropped from yesterday's shock level but not as much as I would have expected given how green the water was yesterday and that there is still visible algae....and it was sunny today. I would have expected the FC to drop a lot more, however, it went from about 28 to 22.5. One variable is that yesterday my CYA level was a bit high. Before shocking, I lowered the water level a few inches and then put the hose in the pool for about two or three hours. The hose was in the pool while I was adding bleach, however, by the time I last tested late in the evening, I had taken the hose out.
Today's reading of CYA is about 45 which means that target shock level is now 16 if I'm understanding this correctly. Since FC was already at 22.5, did I need to add more bleach?
Also I thought I read somewhere that CC can get very high when FC is at shock level. Is that true? I got a reading last night that was so high I was ready to look for zombies in the pool.