After half an hour, flush the toilet. If the water level drops, the clog is clearing. If it remains high, repeat the process once more.
If your blockage is organic—think a "mountain" of waste, wet wipes (that aren't really flushable), or a slow-draining toilet due to biofilm buildup—lye will dissolve it. caustic soda for blocked toilet
Leave just enough water to cover the drain hole. Pour 1 cup (250g) of caustic soda flakes directly into the toilet bowl, aiming for the drain opening. After half an hour, flush the toilet
When in doubt, throw the lye away and snake it out. Your plumbing (and your skin) will thank you. If your blockage is organic—think a "mountain" of
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.