"Free" iodine is the only portion of iodine that kills bacteria. And while some iodine teat dips have the same percentage of iodine on the label, the amount of "free" iodine–and the product's effectiveness–can vary greatly. 

I-tech^™ is a technological breakthrough offering dairy producers superior mastitis control. It provides more "free", thus greater killing power. Tests have proven that teat dips with I-tech can kill more germs in 15 seconds or less than conventional iodine teat dips kill in a minute or more. 

While speed of kill is always important, it is absolutely critical in pre-dipping situations where incomplete sanitizing allows mastitis-causing bacteria to survive on the teat end, which increases the opportunity for infections to develop. 
West Agro teat dips enhanced with I-tech include Quarter Mate^® and Quarter Mate^® Concentrate. Be sure: look for the symbol shown below.