S O U R C E: EPA

EPA specifically chose COREXIT although their OWN EPA studies showed DISPERSIT was LESS TOXIC and MORE EFFICIENT.

No only did Dispersit prove lower in toxicity, 

DISPERSIT was also almost TWICE as effective: 

Corexit         54.7 %

Dispersit      100 %

Dispersit, manufactured by Polychem, a division of U.S. Polychemical Corporation.

Water-based Dispersit is toxic at 7.9-8.2 ppm;

Dispersit holds about one third of the toxicity that Corexit 9500 presents.

Dispersit is a much less harmful water-based product which is both EPA approved

and the U.S. Coast Guard’s NCP list. So why isn’t it being used?

Dispersit has a demonstrated effectiveness of 100% on the lighter South Louisiana crude,

and 40% on Pruhoe Bay’s heavier crude. 

Exxon’s Corexit 9500 is just 55% effective on SL and 55% effective on PB. 

On an average, Dispersit is 70% effective, and may prove 100% effective,

while 9500 is an average of 50% effective, with a maximum effective use of just 55%. 

Corexit 9500 is a harsh petroleum-based solvent which is dangerous to people and sea life. 

Dispersit’s human health effect is “slight to none.” 

Whether or not a dispersal agent is a wise move, the question remaining unanswered is:

Why is Corexit 9500 is being used at all, when the water-based Dispersit is available,

markedly more effective and less toxic?   Follow the money. [SOURCE : May 2010 - one year ago.]

FULL STORY http://www.protecttheocean.com/gulf-oil-spill-bp/