ozzydiodude
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The reason behind watering from the bottom when useing DE it so that it stays dry. When DE gets wet it clumps together and the bugs can crawl right over it without it cutting them up any.
richsoil.com/diatomaceous-earth.jsp
Diatomacious Earth (often referred to as "DE") is an off white talc-like powder that is the fossilized remains of marine phytoplankton. When sprinkled on a bug that has an exoskeleton (such as bed bugs, ants or fleas) it gets caught between their little exoskeleton joints. As they move, the diatomaceous earth acts like razor blades and cuts them up
richsoil.com/diatomaceous-earth.jsp