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Abrasion hazards: a pool/spa surface that presents an unreasonable risk of irritation.
Accessible: methods to providing access to users of the pool area that are physically challenged.
Acid liquid: (muriatic acid or granular (sodium bisulfate) substance used to lower the pool's ph (toward a more acidic condition or to lower total alkalinity levels.
Acid demand: a titration test used to determine proper amounts of acid (or ph decreaser) to reach correct levels. for example, to lower ph from 8.0 to 7.6, your pool may "demand" 2-lbs. ph minus.
Acid Start-up: The procedure of creating a high acid content in the initial pool water immediately after the installation of exposed aggregate swimming pool finishes. The suitability of use of this procedure must be determined and performed by an experienced applicator.
Acid Wash: The practice of exposing the plaster surface to an acidic solution in order to dissolve stains and/or scale. Depending on the strength of the solution used, a certain amount of the plaster surface is also removed via this process. 3M™ Colorquartz™ Aggregate, however, becomes more exposed and color becomes richer over time.
Acidic: opposite of basic-having a ph of 7.0 or below.
Activated carbon: usually granular, used to remove excessive oxidizers (e.g. ozone) odors and colors in pool water.
Activity pool: any pool that is constructed mainly for play activity which uses attractions such as lily pad walks, small slide features and floatation devices.
Admixture: Any materials added to the plaster mix other than cement, aggregate and water. The most common admixtures include calcium chloride (used to enhance flow and trowel characteristics of the plaster), and coloring agents (to produce black and other colors of plaster).
Adult supervision: supervision of a person of at least 18 years old with reasonable ability and intelligence or if less than 18 years old - a person who is trained in supervision by the red cross.
Aeration: mixing water and air. the process in a spa may occur in two ways 1. by using an air blower that would force an air channel through the jets of the spa. 2. by using a venturi air control that would pull the air into it and mix with the water in the jets of the spa.
AF: abbreviation for the alkalinity factor in calculating the saturation index of water.
Aggregate: Marble dust, sand, rocks, limestone, dolomite, pebbles, colored quartz, etc., used as a major component of plaster.
Aggressive water: water which is corrosive due to low levels of total alkalinity and/or ph and/or calcium hardness.
Air binding: the clogging of a filter, pipe or pump due to the pressure of entrained air.
Air bleeder assembly: located on the top of the filter, sometimes accompanied by a pressure gauge, the bleeder is opened to release air trapped in the filter.
Air blower: a device that produces a continuous flow of air.
Air bound: when a pump or pipe will not fill with water due to the pressure of entrapped air.
Air induction system: air is inducted into the empty ducts of the spa's floor or bench activated by a separate air blower.
Air pump assist backwash: this process rapidly decompresses and forces water into the filter body through the reversed elements that dislodges the accumulated dirt to waste by releasing volumes of air by an air compressor or water form a recirculating pump.
Air switch system: an isolated device which utilizes a pulse of air sent down a tube to remotely operate electrical equipment.
Algae: over 20,000 species known to man! algae may form on your pool surfaces or it may bloom in suspension. we typically know algae to be green, but it may also be yellow (mustard algae), black, blue-green or any shade in between. it may form separate spots, or seem to grow in sheets. pink algae, is not algae at all, but a form of bacteria. algae are living, breathing organisms that need warmth, sunlight, and c02 to thrive. for more info: see our algae page in pool technical help center
Algaecide: meaning: to kill algae. algaecides perform best as a backup to a routine sanitation program. they also help to kill airborne spores as they blow into the pool. a variety of algae treatment products are available including copper and silver compounds, poly-quat compounds, chlorine enhancers, and herbicides.
Algaestat: an algaecide kills algae, while an algaestat retards and prevents its genesis and growth.
Algistatic: being able to prevent algae growth.
Alkalinity: alkaline refers to the condition where the water's ph is above 7.0 (neutral) on the ph scale. it is the opposite of acidic. alkalinity is the amount of carbonates and bicarbonates in the water, measured in ppm of total alkalinity. usually measured with methyl orange and phenolphthalein.
Alkali base: a chemical which, when added to the pool water, raises the ph.
Alum: a flocculating agent (aluminum sulfate) used to congeal suspended solids in the water to masses that are filterable.
Aluminum sulfate: also known as alum, this product is used as a flocculent, which attracts suspended particles in the water together (green or cloudy pools). alum sinks everything to the bottom, which is then vacuumed to waste. a small amount of alum can also be used as a sand filter additive.
Ammonia: a compound that contains nitrogen that combines with free chlorine to develop chloramines.
Ammonia nitrogen: transferred into pool water by the perspiration, urine, waste of swimmers to cause eye irritation. reacts with chlorine to form chloramines.
Amphoteric: having the ability to serve as either an acid or base.
Analog meter: a testing device in which a needle is used to indicate readings on the dial face.
Ancillary facility: area used in conjunction with , or operation of, a pool such as locker, public dressing, shower or bathroom area, pool deck area, equipment room or building space intended to be used by pool users.
Anthrafilt: trade name for anthracite specifically ground into particles of the proper size to be used in a swimming pool filter.
Anti vortex drain cover: a plate or cover that is affixed to the main outlet of a swimming pool or spa that prevents a vortex from forming as water passes through to the main outlet.
Atom: the smallest particle into which matter can be broken by ordinary means. combines with other atoms to form molecules of chemical compounds.
Automatic feeders: electronic equipment that senses water variables (primarily chlorine and pH) and controls feed systems to maintain desired levels.
Automatic pool cleaner: a device which agitates or vacuums debris from the was and floor of the pool.
Available chlorine: chlorine, both free or combined, that is active to some degree against bacteria in pool water.
Average head: the resistance to flow of water in a pool re-circulation system obtained by averaging the maximum and minimum resistance encountered in the course of a filter run.
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