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Dispersant has never been used before, underneath the surface of the water. it has never been used in this kind of quantity. government officials saying they're going to be monitoring this and watching this very closely. but that fear remains what long-term effects this might be having on the environment. this is a toxic material, it is not as toxic as the oil they're using it against, but it is still could have consequences. we just don't know what this is going to bring in the future. >> david mattingly, thanks so much. a very windy and rainy new orleans, louisiana. so does it help or hurt...

>> this is ed lavandera with cnn. question about the dispersants. how much was in store already that you guys have been able to use and have you put out an order for more? i guess i'm getting to the issue of there are many people who believe that there are less toxic, environmentally friendlier, cheaper ways of doing this. there is some concern that orders have gone out for more dispersants and i guess people are wondering why you haven't bought those and stuck with i guess -- >> yeah. let me start with explaining what these dispersants do, whether they're applied on the surface or in the subs...