Bare Ground Mag Plus GelMelt Ice Dam Channel Maker. This gel is a long lasting and powerful ice melter. Each 16in tube contains a 2in diameter of gellified Bare Ground Mag Plus liquid. To use, place the extruded tube perpendicular to the roof line before or after the creation of an ice dam to carve a channel or pathway for the water to runoff your roof, preventing ice and water build up which can cause extensive and expensive damage. Also fits easily into gutters and is nearly impervious to rain.