The one thing I do is to use copper sulfate in my outside drain.
I would do this after I got the clog out. I buy my sulfate crystals at where else, Home D.
I do the sulfate twice a year and it helps in keeping out the tree roots on mine.
http://www.drainsandplumbing.com/sew...ncleaning.html
http://www.oldbridgechem.com/CuSO4.html





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