Draino and other over the counter drain openers are very
corrosive and only work (if they do at all) on slow drains and on minor
problems. What happens when you pour a drain opener into a drain that will not
open? The drain cleaner will sit on top of the clog, eating away at your pipe
and causing further damage. When the plumber comes over to fix it, he or she
will then have to contend with both the original clog, and the added corrosion
from the Draino.

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