Composed of Technigom aggregates agglomerated by binder, Aglostic is in the form of molded blocks. Placed inside the gutters, they are porous enough to let rainwater drain ; the density is such as it prevents mosquitoes from passing through. No longer having access to standing water at the bottom of gutters, the pests can no longer lay eggs there. Exit the proliferation of larvae : the claimed efficiency of this device is 100%.