The only flaw was probably user error, after a few days of use I noticed the bag had moisture build up but some dry packets were sufficient enough to get rid of it. Aside from that, the product seems very pure and works well for my plants, I just dislike how attracted to everything the powder is, it’s hard to get all the DKP into my mix because it sticks to the funnel, tools, and bag. This company shipped it very well in a sealed bucket.