Truthfully, I just don't like Purina products for any animals, so I try to avoid it unless it's my only source. Not to say the mites more likely occur in Purina brand, bc that we all know isn't the case. I have to say the longer I'm on this group, the more I'm definitely learning about raising birds. Not like chicken people haven't enough to deal with, but now mites added in to the equation to infest everything and everybody. My goodness. I will have to start being aware of these little critters now, too. I hope you get your mite problem under control soon, & I appreciate you shared this with us. For we newbies to bird raising, we can't help much to solve your issues, but you have taught us much-needed things to be aware of. Thank you.