**5.5 Total suspended solids (TSS)**

The suspended solids are distinct particles which are not soluble in water. These can be separated by filtration and are also calibrated in ppm.

## **5.6 Acidity**

Major natural waters are buffered by a HCO3/CO2 system. Carbon acid is not amply neutralized until a pH of 8.2 and will not depress pH below 4.5. CO2 acidity is in the pH range of 8.2–4.5. The reason of mineral acidity caused in industrial waste having pH is below 4.5.
