"Total suspended solids (TSS)" means solids that either float on the surface of, or are in suspension in, water, sewage, or other liquids, and which are removable by a 0.45 micron filter.
N.H. Admin. Code § Env-Wq 702.33
(See Revision Note at chapter heading for Env-Wq 700) #8590, eff 3-25-06