Bicarbonate of soda is cheap, safe for your family, safe for your septic tank, and incredibly effective. Next time your sink burps up a piece of spinach from last week's dinner, put down the toxic gel and reach for the orange box.
The chemical reaction between commercial cleaners and vinegar/bicarb can create dangerous fumes or even cause the pipe to heat up dangerously fast. If you have already poured chemicals down, wait at least 24 hours and flush heavily with cold water before trying the natural method. bicarbonate of soda to unblock sink