TSS

Total Suspended solids

This is the amount of fine particulate matter in suspension in water of size greater than two microns .  It is measured by weight per volume  of sample and usually quoted as mg/l.

It is similar to turbidity but provides an actual weight of particulate matter rather than a perception. TSS can encompass both organic particlate such as plankton and algae, in addition to inorganic matter such as sand and silts.

In the lab TSS can be measured by dehydrating a water sample and weighed the precipitate. In the field it is possible to measure a TSS using 
infra-red radiation or microwave radiation.

Dip-probe measuring TSS in waterworks with Photonic Measurements dip probe