Total Suspended Solids (TSS)
 

In calculating the TSS, a measured sample is drawn through a glass-fiber filter, retained in a funnel, by applying a vacuum to the suction flask under the filter.  The damp filter with the suspended solids adhering to the surface is dried in a 103-105*C oven for one hour.  The filter is then weighed and the dry weight of the filter with the suspended solids minus the dry weight of the clean filter is the weight of the suspended solids.  The concentration of the TSS is the weight of the dry solids divided by the volume of the sample filtered and is expressed in milligrams per liter.