Articles? Some posts get popular because of recent seasonal bargains. You can use ANY percentage that you find locally and that is a good bargain for you. Just ensure to manually update the "weight" block on the Poolmath Calculator so that it auto-calculates the correct % you are using.
The bleach manufacturers increased the standard strength a few years ago from 6% to 8.25%. As such anything written before then will often use 6% as shorthand for regular strength. Any strength is good as long as it is pure chlorine, no scents or thickeners.
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