Works.

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This stuff works but it is not a quick fix. You have to give it time to work. I apply it at night before going to bed and in the morning another treatment before going out for the day. I do this once a month to keep the pipes clear. It works fine for me and have seen an increase in flow threw the pipes. This is not like liquid drain unstoppers, this is for cleaning years of build up in the pipes and for this it works.

mcknzy via Homedepot.com Hoquiam, WA November 6, 2015