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Water Treatment Issues:

Acid Water

Algae, cyanotoxins

Alkalinity

Alum (Aluminum Sulfate)

Aluminum

Ammonia

Arsenic

Asbestos

Bacteria

Barium

Benzene

Bicarbonate Alkalinity

Boron (Borate, Boric Acid)

Brackish Water

Bromine

Bromate

Cadmium

Calcium

Carbon Dioxide

Carbon Tetrachloride

Chloramines

Chloride

Chlorine

Chromium

Color

Copper

Corrosion

Cryptosporidium

Cyanide

Dichloroethylene

Endocrine Disruptors

Fluoride

Giardia Lambia

Hardness

Heterotrophic Bacteria (HPC)

Hydrogen Sulfide

Iodine

Iron

Iron Bacteria

Lead

Magnesium

Manganese

Mercury

Methane

MTBE

Napthalene

Nickel

Nitrates and Nitrites

NMDA (N-Nitrosodimethylanime)

Norovirus

Odor

Organics

Perchloroethylene (PCE)

Perchlorate

Pesticides

pH

Pharmaceuticals

Radon

Radium

Selenium

Silica

Silver

Strontium

Sulfate

TDS (Total Dissolved Solids)

Trichlorethylene (TCE)

Tritium

Uranium

Vanadium

Vinyl Chloride

VOC


Alkalinity

The Water Quality Association defines alkalinity as "the quantitative capacity of water to neutralize an acid." In other words, it's a measurement of how much acid can be added to water without changing its pH.

Alkalinity in water is usually made up of bicarbonate (HC03), carbonate (CO3) and/or Hydroxide (OH), but phosphates and silicates can also play a role.

The related term, "total alkalinity," frequently called TA, is defined as "the amount of acid required to lower the pH of the sample to the point where all of the bicarbonate [HCO3-] and carbonate [CO3--] could be converted to carbonic acid [H2CO3]."

Although alkalinity is related to pH, it isn't the same thing. High levels of alkalinity stabilize the pH, but water does not have to have a high pH to have a high level of alkalinity.  As alkalinity is the capacity of water to neutralize its acidic content, alkalinity therefore measures how much acid can be added to a water body without changing the pH level significantly

Alkalinity is not regulated as a water contaminant, but it is often tested since it is a factor in amending and controlling pH.

 

Treatment of Alkalinity: In most cases, there is no reason to want to alter the water's alkalinity itself, but changing alkalinity is often involved in changing the pH. Neutralizing treatments with such items as Soda Ash or limestone (calcite) usually raise the alkalinity level as well as the pH.