Chlorine strength? ?

Jun 9, 2014
26
clinton
I went to the local water treatment shop and bought 5 gallons of liquid chlorine, the older lady behind the counter told me it was 15% and one of the field techs told me it was straight chlorine. Is there any way to get an idea what % I'm actually useing? My fc was at 2.5 and after I added 11oz it was up to 6, so I do believe it's quite abit stronger than conventional bleech.
 
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