Achieve a CLEANER, GREENER, PEST-FREE landscape. Prevent UGLY rust or calcium stains caused by irrigation well water. Also automatically fertilize your lawn and/or repel pests every time you water. The American Hydro Injection System hooks up to the irrigation supply to dispense these solutions in small doses every time the sprinklers come on. Rid-O-Rust® stain preventer, GrassSoGreen® fertilizer and NatureShield® pest repellent can all be poured into the same tank without worry. Rid-O-Rust preventer sequesters iron, calcium and other minerals that can stain landscapes and clog irrigation equipment. GrassSoGreen is a phosphorous-free fertilizer that keeps your yard green all season. NatureShield is made with natural cedar and cinnamon oils to always keep your family and pets safe from mosquitos and other pests.