Moss Buster® combines a proprietary blend of powerful essential oils and extracts to quickly kill moss and other pesky bryophytes on your Har-Tru clay court. Moss Buster® does not suppress moss growth or just burn the top layer of moss like other moss "control" products. This patented formula tricks moss and other bryophytes into absorbing Moss Buster. Once contact is made Moss Buster quickly starts rupturing the cells of moss all the way down to the plants rib line. The moss is killed through cell lysis. You will see visual Results within 15 minutes and a full kill in 24 hours! When applied in accordance to label directions and ideal weather and temperatures, MOSS BUSTER® is effective and has been approved by the EPA as a Biochemical Fungicide that kills moss and other harmful bryophytes. 1 gallon container.