Boxiecat litter should not be flushed down toilets.
Due to the fact that clumping litter expands upon contact with liquids, they should never be flushed down toilets or poured into drains. Flushing clay litter may cause plumbing issues.
In addition, most cities advice against flushing any type of cat litter for sanitary and water quality reasons regardless of a litter brand being marketed as "flushable."
Boxiecat recommends scooping litter into a biodegradable baggie, tying it closed, then disposing of used litter in a trash receptacle.