Tofu litter is made of bean-pulp fiber that disperses in water, so many brands label it flushable, but that assumes small amounts and healthy plumbing.
In practice, flushing clumps in bulk causes blockages, especially in older pipes and septic systems, and one clog costs far more than the convenience saves.
There is also an environmental angle: standard wastewater treatment does not fully inactivate toxoplasma oocysts in cat feces, which can harm marine life downstream.
The safe default is bagging used litter with household waste regardless of marketing; if you do flush, use tiny amounts and confirm local rules allow it.
