Sewage mixed with bacteria and protozoa that thrive and multiply in it and lead to its oxidation (see biological oxygen demand).

An organism capable of synthesizing its own food from inorganic substances, using light or chemical energy. Green plants, algae, and certain bacteria are autotrophs.

An analytical method for determining chlorine residual utilizing the reagent DPD (n-diethyl-e-phenylenediamine). This is the most commonly and officially recognized test for free chlorine residual.

An organism that cannot synthesize its own food and is dependent on complex organic substances for nutrition.

Reduction potential (also known as redox potential, oxidation / reduction potential, ORP, pE, ε, or E_{h}) is a measure of the tendency of a chemical species to acquire electrons and thereby be reduce [..]

The TOC (Total Organic Carbon) is one of the most important composite parameters in the assessment of the organic pollution of water. Since it includes all carbon compounds as one mass, it is exactly [..]

Total Bonded Nitrogen

Total Oxygen Demand. Online analyzers for the measurement of Total Oxygen Demand have been available since the 1970s. After the rise of the COD-dichromate method, TOD had been in decline in many count [..]

Plypropolene

See PTFE