Suspended solids refers to insoluble solid particles that either float on the surface of, or are in suspension in water. they are typically operationally defined as particles that cannot pass through a 0.45 µm filter. the following information is from a laboratory test to determine the suspended solids concentration of a sample of untreated wastewater. a 100-ml sample is filtered through a 0.45 µm filter pad. the weight of the clean filter pad and crucible, both of which were dried, cooled, and then weighed, is 48.610 g. after filtration, drying at 104 ˚c, and cooling, the weight of the crucible, filter pad, and dried solids is 48.903 g. what is the concentration of suspended solids in the wastewater sample, in mg/l