1. Algaecides: Algaecides are chemicals that kill algae and blue or green algae. 

          ++  Examples are copper sulphate, iron salts, rosin amine salts and benzalkonium chloride.

          ++  Algaecides are effective against algae. .

2. Antifoams: Antifoam blends contain oils combined with small amounts of silica.

         ++  They break down foam thanks to two of silicone's properties. 

         ++  Antifoam compounds are available as powder or as an emulsion of the pure product.

3. Biocides: See disinfectants

4. Boiler water chemicals: Boiler water chemicals include all chemicals that are used

         Oxygen scavenging; Scale inhibition; Corrosion inhibition; Antifoaming; Alkalinity control.

5. Coagulants: When referring to coagulants, positive ions with high valence are preferred.

       ++  Generally aluminium and iron are applied

       ++  To adjust pH levels Ca(OH)2 is applied as co-flocculent. 

6. Corrosion inhibitors: There are five different kinds of corrosion inhibitors:

       ++  Passivity inhibitors (passivators); Cathodic inhibitors; Organic inhibitors; 

       ++  Precipitation inducing inhibitors; Volatile Corrosion Inhibitors (VCI).

7. Disinfectants: Disinfectants kill present unwanted microrganisms in water.

       ++ There are various different types: Chlorine; Chlorine dioxide; Ozone; Hypochlorite
8. Flocculants: To promote the formation of flocs in water that contains

       ++ Suspended solids polymer flocculants (polyelectrolytes)

9. Neutralizing agents (alkalinity control): In order to neutralize acids and basics.

10. Oxidants: Chemical oxidation processes use (chemical) oxidants to reduce COD/BOD levels

       ++  Remove both organic and oxidisable inorganic components.

       ++  The processes can completely oxidise organic materials to carbon dioxide and water.

       ++  Examples are: Hydrogen peroxide; Ozone; Combined ozone & peroxide; Oxygen.

11. Oxygen scavengers: preventing oxygen from introducing oxidation reactions.

12. pH conditioners: The pH will be converted to approximately seven to seven and a half. 

13. Resin cleaners: Ion exchange resins need to be regenerated after application.

14. Scale inhibitors: are surface-active negatively charged polymers.