Number of Rotations to fully purify 1 liter with the SteriPEN Sidewinder Aaron Cox November 08, 2016 11:14 Updated Follow How many rotations does it take to complete the dose cycle? Related articles Can I use the SteriPEN to purify more than one liter of water? How far should I immerse the SteriPEN ino the water I'm treating? Which SteriPEN model is the best? Which model should I choose? Comments 1 comment Sort by Date Votes Sheryl White January 05, 2012 14:08 Approximately 300 rotations over the 90 second dosage. Some people might crank faster but all that is required is to keep the red light from flashing on during the dosage. 0 Permalink Please sign in to leave a comment.