I have just done an iron-stain removal with ascorbic acid, which meant that Cl had been at 0 for a while, and the water had become somewhat milky cloudy, but not terrible.
I started shocking noon the day before yesterday, bringing FC to 24 and maintaining it there through yesterday. So, this morning, which is after the 2nd night, last night showed zero FC loss (FAS-DPD test) and CC is no more than 0.5.
The milky cloudiness increased drastically as soon as all the chlorine was first added. The cloudiness is improving, but not yet clear. But the SLAM description in Pool School says that cloudiness may take a week to clear, and I have a paper cartridge filter so I do expect that to be somewhat slow.
Since chlorine isn't being lost on the overnight test, indicating there's nothing it needs to attack, and CC meets the goal, is it really necessary to top off chlorine (which will be lost to sunlight) to shock level until the water is completely clear, or can I start letting Cl come down while the cartridge filter slowly clears the water?
Thanks in advance ... Bob