"Quint 5" writes:

Mix 1 cup baking soda, 1 cup salt, 1/4 cup cream of tartar. Pour
1/4 cup of mixture down the drain and follow it with 2 cups of boiling
water.
I don't know how it works, but it has helped keep my drains clear
without dumping a lot of chemicals down the drain.

Um, last time I looked, sodium bicarbonate, sodium chloride,
potassium bitartrate, and dihydrogen oxide were all "chemicals". ;-)

-Sandra the cynic