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Home>Water Filters by Contaminant>Alkalinity Water Treatment


Alkalinity Water Treatment


What is Alkalinity?

The Water Quality Association defines alkalinity as the quantitative capacity of water to neutralize an acid; that is, the measure of how much acid can be added to a liquid without causing a significant change in pH. Alkalinity is often confused with pH as water with a pH above 7 is commonly referred to as alkaline. Alkalinity is not the same as pH because water does not have to be strongly basic (pH above 7) to have a high alkalinity level. Alkalinity is related to pH, because higher levels of alkalinity are useful in stabillizing the pH level. Alkalinity is typically comprised of bicarbonate (HCO3) carbonate (CO3) and/or Hydroxide (OH), but it can also include other anions such as silicates and phosphates. The alkalinity in most water supplies is made up of dissolved bicarbonate salts. Most natural drinking water has an alkalinity in the range of 10 to 500 mg/l. Alkalinity in drinking water is due largely to the presence of sodium, calcium, and magnesium carbonates. See more information on alkalinity below.

Alkalinity Water Treatment (Total Products: 8)

Pentek PCC-106 Phosphate Crystal Water Filter Insert Pentek PCC-106 Phosphate Crystal Water Filter Insert
5-7/16" L x 1-1/16" W; Insert in open core filter cartridges
Pentek PCC-106 Phosphate Crystal Water Filter Insert

Pentek PCC-1 Phosphate Water Filters Pentek PCC-1 Phosphate Crystal Water Filter (9-5/8" x 2-7/8")
9-5/8" x 2-7/8" (244 mm x 73 mm)
Pentek PCC-1 Phosphate Water Filters

Pentek PCC218 Phosphate Water Filter Pentek PCC218 Phosphate Crystal Water Filter (Sold Individually)
9-3/4" L x 2-5/8" W
Sold Individually
(Previously sold by Case)
Pentek PCC218 Phosphate Water Filter

Everpure QC7-DM EV9276-01 Filter System Everpure EV9276-01 QC 7-DM System

Everpure QC7-DM EV9276-01 Filter System

Everpure 7-NE pH Neutralizing Water Filter Everpure 7-NE pH Neutralizing Water Filter Cartridge EV9607-02
20.75" H x 3.25" W; Alternate Part #: EV9607-02
Everpure 7-NE pH Neutralizing Water Filter

Everpure EV9797-21 Kleensteam II Single Everpure EV9797-21 Kleensteam II Single System

Everpure EV9797-21 Kleensteam II Single

Complete Sensafe Home Water Quality Test Kit Complete Sensafe Home Water Quality Test Kit
Tests for iron, chlorine, hardness, hydrogen sulfide,and more. *Bacteria test requires UV light SOLD SEPARATELY*
Complete Sensafe Home Water Quality Test Kit

NTL WaterTest Lab Analysis Water Test Kit WaterTest Laboratory Analysis Water Testing Kit
(BASIC) Water Test Kit to send in for Professional Lab Analysis - 27 Contaminants
NTL WaterTest Lab Analysis Water Test Kit


What do the results mean? Regulations? Standards?

Alkalinity is not regulated as a contaminant. Since alkalinity is related to pH, which can cause corrosion problems, it is an important test to run on water exhibiting corrosive symptoms. When a public water supply exceeds the action level for lead and copper, they must perform a corrosion control study which includes testing for alkalinity as well as pH, TDS, Conductivity and other suspect contaminants.

How do you test for Alkalinity?

Many methods for alkalinity are based upon a titration. The basic method uses an acid to bring the pH level down to an end-point, which can vary, based upon application. The amount of acid used is indicative of the alkalinity level. Many colorimetric tests will use an acid with a color indicator to perform a simple titration in the field. You can get more accurate results using some more sophisticated equipment such as: burettes, pH meter, magnetic stirrer and pipettes.

Water Treatment Options

Since some alkalinity is present in most water supplies and doesn't present a problem itself, the only reason to adjust the alkalinity is when you want to stabilize the pH levels. Since pH can cause corrosion, it should be addressed to maintain plumbing and preventing premature equipment failure. Alkalinity is often raised when soda ash is fed to also raise the pH. Alkalinity will also be affected by using limestone feed tanks or other neutralizing filters.