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Water Chemistry Training - page 14 / 16





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Glossary of Terms


To kill and inhibit growth of harmful bacterial and viruses in pool and spa water.

Dry Acid

A granular chemical used to lower pH and or total alkalinity.

Langelier Index

A mathematically derived factor obtained from the values of calcium hardness, total alkalinity, and pH at a given temperature. A Langelier index of zero indicates perfect water balance (i.e.., neither corroding nor scaling).

Magnesium Hardness

A measure of the magnesium salts dissolved in water - not a factor in water balance.

Muriatic Acid

An acid used to reduce pH and alkalinity. Also used to remove stain and scale.

Non Chlorine Shock

An oxygen based shocking compound. Non Chlorine shock is fast dissolving so it allows swimming just 15 minutes after use. Organic Wastes

Wastes such as saliva, urine, perspiration and sun tan oils which swimmers introduce into the pool or spa. Most organic wastes will not filter out and must be removed by shocking/oxidizing.


Test Regent used to test bromine and chlorine in pool and spa water.


The process of breaking down organic wastes into simpler elemental forms or bi products. Also used to separate combined chlorine and convert it into free chlorine.


A measure of the acidity of water. The pH scale runs fro 0 to 14 with 7 being the mid point or neutral.. A pH of less than 7 is on the acid side of the scale with 0 as the point of greatest acid activity. A pH of more than 7 is on the basic (alkaline) side of the scale with 14 as the point of greatest basic activity.

pH of Saturation

The ideal pH for perfect water balance in relation to a particular total alkalinity level and a particular calcium hardness level, at a particular temperature. The pH where the Langelier Index equals zero.

Phenol Red

Chemical reagent used for testing pH in the range of 6.8 - 8.4.

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