The point is the level.  The proportion of bromate is low compared to the level of hypochlorite.  The level of chlorate and perchlorate is also low compared to the level of sodium chloride, which occurs while the hypochlorite is stored over a period of weeks.  The measurable level of chloride increases.

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The point is the level.  The proportion of bromate is low compared to the level of hypochlorite.  The level of chlorate and perchlorate is also low compared to the level of sodium chloride, which occurs while the hypochlorite is stored over a period of weeks.  The measurable level of chloride increases.