where to buy food grade DE

[BinaryChicken]

i was wondering where i would buy food grade DE because my doves have either lice or fleas.

and would chickens be able to get lice or fleas from doves?

RSVP

 

[BinaryChicken]

and is this food grade? http://www.tractorsupply.com/red-la...s-earth-with-calcium-bentonite-20-lb--1019864