@Patinas you've learned as much in six months as I've learned in eight years. I've had trouble with grain mites, and after the first time when I strained out all the worms and beetles and washed them under the faucet, I now simply place the uncovered tray in a dry place with a breeze blowing over it to kill the mites. Works in about three days to rid the tray of them. I bake my bran and mill run flour in the oven at 275F for about three hours, then turn the oven to the "warm" setting and let it coast for the rest of the day. It seems like overkill, but I was still getting mites after oven treating. My freezer is too tiny and not cold enough to kill mites. It should be a zeroF temp to do the job.