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www.foxlabs.com makes the strongest OC.The OC's effectiveness is rated in SHU's.Most populat OC brands are 2,000,000 SHU's or less and Fox's is 5.3 million.Many people are misinformed and think the higher % of capscium the stronger the spray.Fox sprays are used by many LEOs.As far as spray/stream/foam....I prefer a spray but I think it is just a personal preference.