Which? found the sun protection factor (SPF) for one unnamed product fell by 59% after 40 minutes in salt water. . http://www.heraldscotland.com/news/16246609.Sunscreen_water_resistance_claims_not_backed_by_testing/

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Which? found the sun protection factor (SPF) for one unnamed product fell by 59% after 40 minutes in salt water. . http://www.heraldscotland.com/news/16246609.Sunscreen_water_resistance_claims_not_backed_by_testing/