FLOW RATE: The amount of water flowing past a specific point in a specified time (e.g. the number of litres flowing through the filter in 1 hour).
GATE VALVE: Also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The valve turns "righty-tighty; lefty-loosey."
GAS VALVE: An electronic valve in the pool heater that directs gas flow from the meter to the pilot and the burner tray.
GASKET: A gasket is a mechanical seal that fills the space between two objects, generally to prevent leakage between the two objects while under compression. Gaskets are commonly produced by cutting from sheet materials, such as gasket paper, rubber, silicone, metal, or a plastic polymer.
GROUND-FAULT CIRCUIT-INTERRUPTER: A GFCI device protects a circuit from branching off by de-energizing the path of electricity very quickly when it senses current loss. An important safety device around water (the pool?).
GROUT: A mortar or paste for filling crevices, esp. the gaps between wall or floor tiles.
GUNITE: A mixture of cement, sand, and water applied through a pressure hose, producing a dense hard layer of concrete used in building for lining tunnels and structural repairs.
HALOGEN: A member of the family of elements fluorine, bromine, chlorine and iodine.
HARD WATER: Water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap.
HAZMAT: A hazardous material, a term used almost exclusively in the United States, is any solid, liquid, or gas that can harm people, other living organisms, property, or the environment. Hazmats may be radioactive, flammable, explosive, toxic, corrosive, biohazardous, an oxidizer, a pathogen, an allergen, or may have other characteristics that render it hazardous in specific circumstances.
HEATER: A device used to heat the water. It may be electric, fuel operated or solar powered heat.
HEAT EXCHANGER: A set of 8 or 10 ribbed copper tubes that absorb the heat produced below it and transfer it to the water cycling through its tubes.
HEAT PUMP: The antithesis of the air conditioner, the heat pump's cooling coil removes heat from the air while the condenser coil transfers it to water cycling through it.
HOT TUB: Usually considered a circular, wooden vessel filled with heated and circulated water.
HP: Horsepower (hp) is the name of several non-metric units of power. The most occurring conversion of horsepower to watt goes 1 horsepower = 745.7 watts.
HYDROXIDES: the most common name for the diatomic anion OH−, consisting of oxygen and hydrogen atoms, usually derived from the dissociation of a base. It is one of the simplest diatomic ions known.
HYPOCHLORITE: A family of chlorine compounds such as Calcium Hypochlorite and Lithium Hypochlorite, both granular, and the liquid Sodium Hypochlorite. When these compounds contact water, they release Hypochlorous Acid, the active sanitizing agent.
HYDROSTATIC PRESSURE: A force involving built up ground water which creates upward pressure beneath the pool shell.
HYDROSTATIC RELIEF VALVE: Fitting(s) installed in the floor of the pool designed to manually or automatically release hydrostatic pressure beneath the pool by allowing ground water into the pool.
IMPELLER: The rotating vanes of a centrifugal pump; its action creates the flow of water. The impeller is shaft driven by an electric motor.
INFLUENT: The water coming into and up to the impeller from the suction lines. These pipes are under vacuum pressure.
ION: An atom, or group of atoms that possess an electrical charge.
IONIZER: An ionizer is a device mounted on your return line, and through which water flowing will receive charged metal ions. Manufacturers may use a copper anode and/or silver. Copper is an algaecide and algaestat, while silver is known for its properties as a bactericide. This electric, limited technology has been replaced by the Vision System.
IRON: Usually introduced into the water from iron plumbing or from well water, Ferric Iron can stain surfaces, while Ferrous Iron will turn your water a clear green color.
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