: I returned with one last kettle of boiling water. As I poured it in, there was a satisfying glug-glug-whoosh as the blockage finally gave way. Why It Worked
It is critical to identify scenarios where soda crystals are ineffective or counterproductive:
: While Soda Crystals are generally safe, avoid excessive use of highly corrosive "caustic soda" (sodium hydroxide) if you have uPVC pipes, as it can generate heat that warps them if it doesn't dissolve properly.