Demon WP comes in a 1 pound container with a scoop for easy measuring. Demon WP is a Cypermethrin-based wettable powder concentrate that is effective against many different insects, including roaches, ants and other crawling pests. It has virtually no odor and is very easy to use. It’s a fast killer with an excellent residual, and continues to kill for up to three months! A & E doesn’t recommend the use of Demon WP on the inside of your home or business, as it can and will leave a visible residue.