Back flow cones are designed to only be used with back flow burners. The cones have a hole through them and the Backflow burner has a hole where the cone is placed. This results in the smoke going downwards swirling around the burner creating a cool effect. You should also put a protective mat under backflow burners to prevent moisture damage from the smoke
Backflow Incense is created with two ideas in mind; Cleansing the air & Making it physically appealing when doing so.
Flowing like water, smoke pouring down the burner like subtle waterfalls- Not only is it a joy to smell, but a pleasant one to watch.