Total suspended solids (TSS) are reported in either grams/liter or milligrams/liter. A liter or exact fraction thereof is filtered and dried. The dry weight and the original filter weight (measured in milligrams or grams) are subtracted from the wet weight (filter, including filtrate before drying), and the result is TSS in g/l or mg/l.
Turbidity as measured by a nephelometer, is calculated by the system and typically includes temperature compensation and, depending on the system, compensation is also made for true color.
Once a Secchi depth measurement has been attained, it can be used to estimate the depth at which light can penetrate into the water column, which is referred to as the compensation point or photic depth, and provides an approximate maximum depth to which light can penetrate. To make this approximation, one may multiply the Secchi depth by two. For example, if a Secchi depth is five feet, then we can multiply the Secchi depth by two to estimate the depth of light penetration:
2 X 5'(Secchi depth) = photic depth of 10 feet.
Note: Using the example above, if the lake happens to be eight feet deep, then our calculation tells us that light is probably reaching the bottom.