My pool was getting low on CYA so I decided to use some leftover old Trichlor to raise it. My pH had also risen to around 7.6 and my TA was up at around 140 (mostly from some evaporation and fill water that has a TA of 80 -- remember that with evaporation chemicals accumulate). Anyway, my water was clear, but not quite as crystal clear as I had remembered it. Then, after adding the Trichlor and raising the CYA AND having the pH lowered to 7.2, I noticed that the water was really crystal clear (at roughly the same disinfecting chlorine level). The saturation index beforehand was around 0.1 to 0.2 while now it's around -0.3 so keeping the saturation index slightly corrosive (i.e. slightly negative) may have a side benefit of even more crystal clear water. I know that Ben used to say to keep the saturation index slightly corrosive to prevent scale on gas heater heat exchangers, but water clarity can be another benefit.