- Floc size & density
- Free bacteria cells in solution (at 400x magnification this looks like small rods or circles bouncing around)
- If septicity is a common problem note the number of spirochetes
- Protozoa - note numbers of amoeba, flagellates, free swimming ciliates, crawling ciliates, and stalk ciliates
- Metazoa - any rotifers or worms should be noted
In the SV30 test, an high loading increases turbidity before anything else happens. Turbidity is due to free bacterial cells in the solution.