FertiGro Rust Stopper Keep Rusts Stains from Happening The FertiGator can inject FertiGro Rust Stopper into your sprinkler system so it is delivered every time you water and stop rust stains before they start. The FertiPro is programmable by zone so you can solve any rust problems efficiently and effectively. Simply send out Rust Stopper in those zones near your house; driveway and other susceptible material and it will prevent stains from occurring. The FertiPro delivers exactly what you need where you need it. Protect the Environment and Your Family from Unnecessary Chemicals FertiGators apply small amounts of fertilizer that you plants can absorb efficiently. Your grass and plants will be healthier which means fewer applications of pesticides; fungicides and herbicides. Using FertiGro fertilizers and specialty lawn care products will keep your yard healthy and safer for your family and pets.