RoofMelt is designed to be tossed onto the roof's problem areas where ice dams have formed. It begins to work when it comes in contact with the trapped water and begins to melt away (from the bottom up) the existing ice dam. 65 calcium chloride tablets per bucket.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.