Diatom is a 100% natural product and can be used for residual Red Mite control. After the Hen House has been given a thorough clean with Poultry Shield, sprinkle some Diatom around the inside edges of the Hen House and also under the nest boxes and perches. Diatom is harmless to Humans and Animals but is like a razor sharp snow flake to the Red Mite and scratches the hard waxy shell, leading to the Mite dehydrating and dying. Diatom is also a great natural supplement for the Chickens . Use Biocides safely, always read the label and product information before use.