The Crary WeedRoller slowly rolls along the lake bottom, agitating the lake bed material. This agitation prevents lake bottom weeds from rooting down. Meaning, with routine use, these weeds are simply removed before they even appear. If your plans for a weekend at the lake are tangled up in weeds, you need an environmentally friendly WeedRoller. You don't want to use hazardous chemicals in the lake to control weeds and other weed removal products such as rakes are troublesome and very labor intensive. Plus, who wants a big pile of wet, stinky weeds laying around the dock after removal? Not to mention the weeds will soon return. The WeedRoller not only does the job once, it continues to patrol the lake bottom for regrowth. How does it work? The WeedRoller moves in a slow, broad arc, pivoting more that 270 degrees. As its linked rollers rotate along the lake bottom, the WeedRoller detaches existing weeds and agitates the lake bed. This prevents more weed growth, for a clean, sandy lake bottom and a pleasant swimming area. The WeedRoller easily attaches to any dock. To fit your specific area, the WeedRoller has adjustable limit switches, which automatically stop and reverse its direction, at the point you desire.