No, the powder is an anti-bacterial used for cows drinking water to treat some bacteria in the gut that I don't recall the name for...
Here is another website I got from Google, I don't know if this will work for you.
http://www.worldpetstore.com/prov6oz.html
If not....
Have any bleach? It will be VERY hard to treat all the mites this way, especially with a large burmese...
Switch out his bedding to a paper towel or newspaper. Leave all decorations out of his cage except for a plastic water bowl.
Wash his cage with a mixture of bleach and water. 1 oz for 1 gallon solution, Soak all of his things in it to kill any eggs or mites. Clean the enclosure thoroughly, making sure to get all the nooks and crannies.
When done, rinse very well, so there is no residue left behind.
Bathe the snake in some water with a few drops of dishsoap, that will only kill any adult mites on him.
You should redo these steps after 2 weeks again, and then after 2 weeks do it again. Even so, you may still miss some mites or eggs themselves. This is not a fool proof solution and takes a lot of work.
Mites are nocturnal, so you may never see them on the snake itself...