BIO-PREP is a water pre-treatment that reverses the negative effects chlorine has on biological products. Chlorine is added to rural and municipal water sources to kill microbes, making those sources safe for drinking. When you use chlorine-treated water to fill your sprayer, it will kill any beneficial microbes you might be applying for your crops. BIO-PREP transforms chlorine into the safer form, chloride, which is an essential plant nutrient and no longer harmful to beneficial microbes.