Use of the PulsFOG requires a carrier solution to help reduce surface tension and create evenly sized droplets. There are three solutions available. For most horticultural applications, NutriFOG is the preferred carrier. VK-I and VK-II are also available. NutriFog and VK-II are for all chemical formulations and mixed with water. VK-I is for EC chemicals only and is NOT to be mixed with water.