DE is a deterrent at best. ACV is a great source of calcium, both for humans, and animals. IF you don't have an infestation, using deterrents is good, but when you've got a full blown infestation, it's time to use something that's quick, and effective. I agree that overuse is not good. BTW, DE causes respiratory issues, so even be careful using that.
As with chemicals....even apple cider can cause excess acid and gastric conditions......all must be used wisely...also.
Yep...DE to be used only with proper breathing control and with animals outside.