You cannot pour caustic soda into a toilet full to the brim. Use an old cup or scoop to remove most of the standing water into a bucket (dispose of this dirty water outside or down a sink after the toilet is fixed).
Once the drain is flowing, flush the toilet three times to ensure all caustic residue is gone. Do not urinate in the toilet for an hour (urine is acidic and can react with remaining lye to release fumes). The Final Verdict Use caustic soda as a last resort before calling a professional—not as a first response. caustic soda for blocked toilet
When in doubt, throw the lye away and snake it out. Your plumbing (and your skin) will thank you. You cannot pour caustic soda into a toilet full to the brim
For 90% of toilet clogs, a (with a good seal) or a toilet auger (a $30 snake) is safer, cheaper, and more effective. Use caustic soda only for slow-draining toilets caused by organic sludge, and only if you are comfortable handling industrial chemicals. Do not urinate in the toilet for an
Before you pour, here is the complete guide to using caustic soda on a toilet blockage. Unlike bleach (which disinfects) or sulfuric acid (which chars organic matter), caustic soda works via saponification . It turns fats, grease, and organic waste (like toilet paper and feces) into a water-soluble, soap-like substance.