Table 9.5.

Most Common Treatment Techniques in Relation to the Hazards That Need to be Controlled (✓Indicate Most Preferred Technique)

Treatment Method	Hazards/Dangers/Threats/In Water
	Solids	Odors/Flavors	Algae	Protozoa	Bacteria	pH	Organic Chemical Residues	Salts, (Hardness)	Viruses
Settling	✓
Deaeration		✓					✓
Activated carbon	✓	✓	✓a				✓	✓
Neutralization						✓
Membrane filtration (RO)	✓		✓	✓	✓		✓	✓	✓
Chlorination/ozonization				✓b	✓				✓c
Ion exchange							✓	✓
UV radiation				✓b	✓				✓
Electrochemically activated water			✓	✓	✓				✓

^aIf contamination is detected; RO=Reverse osmosis.

^bCryptosporadium.

^cDepending on virus species.