Tuesday morning, city councilors unanimously approved testing the powder for the next two and a half months at a cost of around $400,000.
They've been testing the product over the last few weeks and say they've found an application method that they believe will work.
The water development will would study the results at the end of the two-and-a-half month trial and decide if it works.
Officials say the only other lake that has used this type of powder is in Las Vegas and is 3 times smaller than Lake Arrowhead.
Wichita Falls will be the first city in Texas to tackle this project.
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