... 3.safe to use 4.OEM,ODM is available Powder Drain Cleaner, Drain Pipe Cleaner, Powder Toilet CleanerProduct Features:1.Dissolves dirt, grime ... are not corrosive and will not damage pipes.Instructions1) For drain pipe cleaning, pull out the plug, empty one bag into the ... drain pipe and then rinse with water. 2) For toilet pipe cleaning, empty two bags into the ...