Hey I am late to this party, but I am one of the people who recommend DE...I have used it in my house, bird cages, and outside in my Sulcata enclosure, in Oregon with black ants...It worked for me, except, it's messy in the house and kinda hurt my vacuum but it worked so good outside, now, I did spend some time and energy monitoring the parimeter and kept on it for a couple of weeks...