By adding TurfTracker marking system to existing spreader, user can put lawns to bed for the winter, without over-fertilizing or streaking grass. Assures precise application of fertilizer to prevent strips of weed growth or grass discoloration. Attaches to spreader in less than 2 mins. Mixes dish soap andinto a single tank, creating a visible, earth-friendly foam that spreader distributes along with fertilizer. Comes in 5 models to fit small, hand-operated spreaders and sprayers, as well as larger turf equipment covering up to 18-ft. widths. Price: ranges from $35 to $254, depending on model.