Well, I can't remember why he said not to use Drano, but he did say it can actually make things worse. I hope it works in your case-just remember the bleach idea if there's ever a "next time!"
The reason may be that Draino was created for thick metal pipes and can corrode even those. These days with so many pipes being pvc plastic it can actually melt them and unseal glued connections or rubber washers and grommets. It's one seriously hot chemical reaction.
Oh for the septic go outside to a spot just outside the house where a large pipe with a white cap is. It may be under an oblong lid that says septic or drain. Use a pipe wrench on the square projection to open the pipe and look for an obstruction there. Kids like to flush underwear and stuff. Sometimes it gets stuck at just that spot.
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