Turbidity is a measure of the cloudiness of water, which is due to suspended solids. Higher turbidity levels are generally associated with higher levels of disease causing microorganisms. When designing a filtration unit, turbidity should be taken into account because sediment can build up and clog the system over time.
According to the U.S. EPA National Primary Drinking Water Regulations, turbidity can never exceed 5 NTU (Nephelolometric Turbidity Unit).
Turbidity Test Kit (two tubes and standard reagent)
Where to Buy Materials:
- Acorn Naturalists – sells a “Turbidity Test Kit” for $60 and standard turbidity reagent refills for $10. http://www.acornnaturalists.com – search “turbidity”
1. Fill one tube with 25mL clean water and one tube with 25mL sample water.
2. Add drops of standard turbidity reagent until both tubes look the same.
- the bottom of each tube has a black dot on a white background, look down the tubes at this dot to compare them.
- count the number of drops added
3. Determine the JTU (Jackson Turbidity Unit) value from the number of drops added.
- Different standard reagents with have different concentrations, read the bottle for proper drop to JTU correlation.
- 1 JTU = 1 NTU