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One problem with copper sulfate root killers for toilet applications, either septic or sewer, is that the ingredients flush past the roots along with the water. There is a new product called Root 'N Clean that solves that problem by using water soluble packets that get caught by the roots so that the foam coats the roots after the water has flushed by. It also allows consumers not to touch the copper sulfate or deal with hazardous materials at all. As a result, it is safe to use and very effective as a copper sulfate root killer.
http://www.coppersulfaterootkiller.com/home.html
Greg
Root 'N Clean

I work for a water dept in Texas, we use Copper Sulfate in our main sewer lines. If you have to rock salt will work also, but do not use it if on a septic tank.
Our local Rent-All center where my husband went to rent a 'snake' to clear our sewer lines told him to pour a gallon of bleach all at once down the toilet once a month, that it will kill the roots. So far, it seems to have worked for us and it's been over a year with no problems.
Rebecca,try calling your local City Garage & asking.I know that here we just take a container (like a juice can or smaller) & they will fill it with a blue rock like substance - it might be the same as other posters posted already I don't know.
But they give it away some places.
You might check out this as a possibility before you spend any money on anything commercial!
One thing that I know works. It is Copper Sulfate Pentahydrate. We got it at Home Depot and Menards. It has two different names. One is called Root Gone, the other Root Kill, but it is the same thing. Use it as per the directions on the jug. It works for us. It costs about $8 to $10 for one treatment.