Before endotoxin detection in plasma-treated water, 0.01% (w/w) sodium hyposulfite was added to quench active particles caused by plasma. Furthermore, 0.01% (w/w) sodium hyposulfite was also added to the raw water from the WTP, to quench residual chlorine [28] . To prevent pH interference during the TAL assay, Tris-HCl buffer was used to maintain pH at 7.4