Glossary Of Swimming Pool Terms & Definitions - H | Print |
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HALOGENS The chemical elements either individually or collectively that constitute Group VIIB of the Periodic Table of Elements: fluorine, chlorine, bromine, iodine and astatine. Of these, only chlorine and bromine are used as disinfectants and sanitizers in pools and spas.

HAND RAIL A tubular steel or plastic device that can be gripped by swimmers or bathers for the purpose of steadying themselves. Usually located near the steps in the pool.

HAND SKIMMER A screen attached to a frame which is then attached to a telepole used to remove large floating debris, such as leaves and bugs, from the water's surface.

HARDNESS The amount of calcium and magnesium dissolved in the water. "Water" or "total" hardness refers to the total magnesium and calcium dissolved in the water. Calcium hardness refers to just the calcium. Measured by a test kit and expressed as ppm. The proper range is 200 to 400 ppm.

HEAT EXCHANGER A device located inside the heater providing for the transfer of heat from the heat source to the water. This is usually a seriew of metallic tubes with fins located just above the flames.

HEATER A fossil-fueled, electric or solar device used to heat the water of a pool, spa or hot tub.

HERBICIDE A chemical compound used to kill or control plant growth or algae. Simazine is a common pool herbicide.

HORSEPOWER The work done per unit of time. 1 horsepower equals 33,000 foot-pounds of work per minute or approximately 746 watts. Motors for pumps are rated in horsepower.

HOT TUB A spa constructed of wood with the sides and bottom formed separately and joined together by hoops, bands or rods.

HYDROCHLORIC ACID Also called muriatic acid - A very strong acid used in pools to lower the pH and total alkalinity. It can also be used for various cleaning needs. Used in "acid washing" a pool. Use extreme care in handling.

HYDROGEN The lightest chemical element. A component of water, and a frequent product of many chemical reactions. pH is a measure of hydrogen in its ionic form in water.

HYDROGEN ION The positively charged nucleus of hydrogen atom. The relative degree of acid or base of a solution (called pH) is a measure of hydrogen ions.

HYDROGEN PEROXIDE An unstable, colorless, heavy liqued used as a bleach in industry and as an antiseptic in households. It is used as an oxidizing agent in pools and spas. May also be used to de- chlorinate pool or spa water.

HYDROJET A fitting in the pool or spa on the water return line from the equipment that blends or mixes air and water, creating a high- velocity, turbulent stream of air-enriched water.

HYPOBROMOUS ACID The most powerful disinfecting form of bromine in water. Sometimes called the killing form of bromine.

HYPOCHLORITE The name given to a family of chlorine- containing compounds, including calcium hypochlorite, sodium hypochlorite and lithium hypochlorite, that are used as disinfectants and sanitizers in pool and spa water.

HYPOCHLOROUS ACID The most powerful disinfecting form of chlorine in water. Sometimes called the killing form of chlorine.


Salt in Water

When salt is dissolved in water, the sodium and chlorine break apart to form free sodium ions and chloride ions. Effectively keeping your pool clean.

Baracuda G2

A Baracuda G2 has a 36 - finned disc.


The most common and effective sanitiser of swimming pools in the world is Chlorine.

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