I have 2 questions:
1. Does CC show up overnight if you have algae/organics? I did a chlorine test last night around 9 pm. I got a reading of 5 and absolutely no cc. This morning (I got busy and forgot so the sun had been on the pool about 90 min. Equipment had not yet kicked on) and the reading is 4.0 and .5.
2. CSI. When I put all my numbers in the pool calcuator, everything appears to be balanced according to my target but the CSI shows "potential to become corrosive to plaster". Everything I have been targeting is dead on so I'm confused. In fact, I usually shoot for a pH of 7.3 or 7.4 b/c I know it rises quickly. Today is 7.5 and the lower I take my pH in the target column the worse the CSI becomes. My CH is high but the HIGHER I put that target column the BETTER my CSI becomes. I'm confused. I definitely don't want to target a higher pH due to scaling potential. At low CSI what is the risk? The articles I find on CSI are for chemistry majors (of which I was not). Should I just not worry about this number right now and focus on keeping my pH and TA in check?