F-D-S is a 4th generation Foliar Delivery Agent that is designed to deliver your foliar applied sprays with unrivaled efficiency and power. F-D-S utilizes next generation Active Transport Technology that ""literally"" pushes and then pulls your foliar applied elements through the leaf's plasma membrane and delivers them directly inside the chloroplasts of your leaves. This Active Transport method is up to 6 times more effective at delivering your foliar applied elements compared to the leading brands.