How do u solve a blocked tub ? ...

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Answers:    Go to Wal-Mart, the plumbing section, and buy a Zip-it (about $3). If that works, great. If not, phone a plumber.

BTW, draino & other products like it don't work vastly well, if at adjectives, and are not the best thing contained by the world for the drain pipes (regardless of what they tell you).
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Pour within Plumbers Helper. Your drain is blocked w/hair. Or you could try using a plunger.