When To Chlorinate?

[Snowymoon]

Is it best to chlorinate only at night, or do you do it just when the numbers deterimine you need to add it? For example, if my target range is from 5 to 10, but my TC level is about 6 when I test mid morning, do I add some then or wait until evening?

[KurtV]

Here's Ben's advice on the topic: http://www.poolsolutions.com/tips/tip06.html

Bottom line is that he recommends evening chlorination to save on chlorine costs. I wouldn't sacrifice maintaining proper chlorine levels at the altar of saving a few dollars (e.g. your scenario of finding borderline chlorine levels at a mid-morning test) , but with daily testing and a little planning you should be able to chlorinate almost exclusively after dark.