In our experience magnesium chloride is the safest and all around best easy to find ice melt you can use in an absolute emergency.
Is magnesium chloride safe for roofs.
It s environmentally friendly and safe around plants if it s not over applied and it works well sub zero temperatures.
Rock salt is sodium chloride cheap and poor.
Salt will leave a white residue and is very corrosive to unprotected ferrous metals so you might turn your black roof edge into a chalky mess with salt.
Calcium chloride is the most aggressive ice melter working down to well below zero and magnesium chloride is very good.
Compared to less soluble forms of magnesium magnesium chloride is absorbed almost completely in the gut increasing its bioavailability in the bloodstream.
If you re not careful however magnesium chloride.
Calcium chloride is the best salt to use on ice dams according to handyman glenn haege.
Although magnesium chloride still has risks associated it in my opinion it s the lesser of all evils.
It melts ice faster than sodium chloride does works at lower temperatures than sodium chloride and also melts larger volumes of ice.