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Pool Glossary (cont.)

A I B I Bre I C I Chl I Cya I D I E I F I Flo I G I H I I I

L I M I N I O I P I Q I R I S I Sta I T I U I V I Vol I W I Z



JANDY VALVE:  A brand name of a three way valve, which has simplified pool plumbing.


JET PUMP:  Used in spas to provide additional thrust into the hydrotherapy jets.


LADDER BUMPERS:  Rubber caps or inserts which protect the pool plaster or vinyl liner from the sharp steel ends of the ladder.


LANGELIER INDEXAlso called the Saturation Index, Mr. Langelier devised a system to determine water balance by assigning values to levels of pH, Total Alkalinity, Calcium Hardness and water Temperature. When all parameters are in balance, the water will neither be corrosive or scaling. The formula is "SI = pH + TF + CF + AF - 12.1."


LATERALS:  Elongated, capped plastic nipples at the bottom of a sand filter which are slotted to allow for water passage while keeping the sand in the filter tank.


LIGAND: An atom, ion, or molecule that generally donates one or more of its electrons through a coordinate covalent bond to, or shares its electrons through a covalent bond with, one or more central atoms or ions (these ligands act as a Lewis base).


LOAD:  An electric device which consumes energy, placing a load on the source.

LOW WATER SUCTION:  An influent fitting, typically low on the wall in the deep end of a vinyl liner pool. A cheaper alternative to a main drain.



MAGNESIUM: A light, ductile, silver-white, metallic element. Its presence in high non-chelated concentrations can lead to stains & scale when conditions are right


MINERALS:  Such as Calcium, Manganese, Magnesium, Nickel, Copper, Silver, Iron, Cobalt or Aluminum. Their presence in high non-chelated concentrations can lead to stains & scale when conditions are right.


MICROORGANISM:  A living, breathing creature in your pool. The purpose of disinfectants are to remove such "infectants."

MECHANICAL SEAL:  A seal behind the impeller which prevents water from running out along the shaft of a motor. aka; pump seal.

MOTOR:  A machine for converting electrical energy into mechanical energy. Your motor is known as the dry end of the filter pump. It drives the impeller, which moves the water.


MPV: A Multiport valve. (See Below)


MSDS: Material Safety Data Sheet is a form containing data regarding the properties of a particular substance. An important component of product stewardship and workplace safety, it is intended to provide workers and emergency personnel with procedures for handling or working with that substance in a safe manner, and includes information such as physical data (melting point, boiling point, flash point, etc.), toxicity, health effects, first aid, reactivity, storage, disposal, protective equipment, and spill handling procedures. The exact format of an MSDS can vary from source to source.


MULTIPORT VALVE:  A 4 or 6 position valve combining the functionality of several valves into one unit, revolutionizing pool plumbing. The six common functions are described below: 

  1. FILTER: Keep it here 99%, except when backwashing, rinsing or wasting

    RINSE:   Use this setting for 20 seconds after backwashing to rinse tank

    RECIRCULATE: Use this if the filter's broken; at least you're circulating.

    BACKWASH: Use this setting to reverse the flow in the filter and send water   out of the waste line. Make sure valves are open or hoses rolled out

    CLOSED: Put here to close off flow from the pool, usually to work on the equipment. Do not operate pump with valve in closed position

  2. WASTE/DRAIN: Another filter bypass setting, but this setting sends the water out of the waste pipe (hose), instead of returning it to the pool. This setting is used to lower pool water level or to vacuum to waste.

MURIATIC ACID:  The liquid dilution of Hydrochloric Acid used to lower pH and alkalinity, and to remove mineral stains and scale. Extremely caustic and corrosive.



NASCENT OXYGEN:  A single oxygen atom, not yet bonded to anything. Extremely powerful oxidizer when harnessed.


NITROGEN:  When combined with chlorine, nitrogen creates chloramines, which do not belong in our pool. Nitrogen can be found in many swimmer wastes (perspiration, suntan oil, hair tonics, etc.) or be introduced by other means.


NON-CHLORINE SHOCK:  A granular form of potassium permonosulfate, used to oxidize materials such as microorganisms, contaminants or chloramines.  


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