In a large saucepan, combine the corn syrup, water, and salt. Pour sugar into the saucepan, trying not to hit the sides of the pan with the sugar. Place the pan over medium high heat and let the sugar melt into the water. Swirl the sauce pan to help the sugar dissolve. Once the sugar is melted clip a candy thermometer on the the pan and continue to boil until the mixture reaches 260 degrees (the hard ball stage) which is about 8-10 minutes. Do not stir during this step.