Correct boric acid?

I can get a 50 lb fine powder from fleabay $60 or 50 lb granule $94 from Duda. I'm not accustomed to using chemicals that doesn't add up to 100% or real close. Thank you for the explanation JN.

You want the granular boric acid not the fine powder. The fine powder will gat blown around by the wind and sit in the water surface. Granules will sink and mix better.
 
I should have mentioned, even though I posted the link to Duda, you can buy from Duda off of eBay for less than direct from Duda for some odd reason. Last time there was a $20 difference including shipping.
 

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