I removed a few soup cans full of small roots from my main drain with a
power auger (snake). I have no way of knowing how far in the line these were
growing but I suspect it was the toward the end. The unfortunate thing is,
the auger was 100' long but the line is probably 125'; there may be more
beyond but the water is flowing well now.



I was introduced to copper sulfate as a possible remedy. I'm skeptical. The
container claims it kills roots and is to be used while there is still flow
but I wonder just how effectively it does kill roots. Instructions call for
anywhere from 2 to 5 pounds to be flushed down a commode twice a year.



Will someone with some understanding of how copper sulfate really reacts
with small roots in a drain please comment.