The composition of TSS ?

What is the composition of TSS in EFDC Explore ?
If i want to know the concentration of TSS, which parameter must be simulated in the 21 water quality parameters in EE ?
Thank you for your attention!

TSS is currently defined in EE as inorganic suspended solids. While TSS can be considered a WQ parameter, it is not eutrophication so it does not require you simulate any of the 21 WQ parameters.