What's a good place to source DE grids?

I just had fantastic luck landing potent and still 10% LC from grocery stores just wanting to make shelf space. You all taught me how to test the potency here:


I'm now extremely excited having landed this deal and see 50lb of DE on sale for $35 on eBay - to me atleast, that's a fantastic price but I also don't want to purchase a bag of talcum power and dump it into my filter

Is there a way to check if the DE I have is fake or contaminated?
 
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