Swimming Pool Glossary of Terms


  • Acid Demand - A titration test used to determine the amount of acid in a swimming pool to reach correct levels.
  • Acid wash - A method that uses acid to clean the interior of a swimming pool.
  • Algae - Aquatic organisms containing chlorophyll that can grow in colonies.Algae have the capability to conduct photosynthesis.The most common algae in swimming pools are green, black, and yellow.
  • Algaecides - A chemical compound used to kill, control, and prevent algae in pools.It comes in different types including herbicides, poly - quat compounds, and chlorine enhancers, among others.
  • Alkali - A base used in swimming pools to increase the water’ s alkalinity level.
  • Backfill - To refill an excavated area after the construction of a pool.
  • Backwash - The process of reversing the flow of water to thoroughly clean dirt in a filter.
  • Balanced Water - The result of keeping the five basic pool water components such as pH, calcium hardness, alkalinity, stabilizers, and total dissolved solids in their proper levels.
  • Chlorinator - Any kind of device that adds chlorine into pool water.
  • Chlorine - Any type of chlorine compound used to disinfect a pool.Chlorine is used to kill bacteria or control the growth of algae.
  • Corrosion - The result when a pool 's water is imbalanced. Corrosion may result to erosion, etching, or pitting of pool's surface and equipment.
  • Calcium hardness - A test that is conducted to determine the mineral calcium levels in a pool.
  • Dosing system - A feeder that introduces chlorine in the water.
  • Diverter valve - A plumbing fitting installed in a pool to control or divert the flow of water.
  • Drain - Situated at the bottom part of a pool, the drain also called as the "main drain" is a plumbing fitting that is connected to the pump for filtration or circulation.
  • Exposed aggregate - A type of pool finishing made from the blending of ingredients such as quartz sand, metallic oxides, and white cement.
  • Efficacy - In swimming pool terminology, efficacy means the chlorine 's effectiveness, which is affected by the water balance, sun, and chlorine.
  • Filter - The device used in pools to remove particles in the water through a porous substance.Common types of filters are cartridge, sand, and diatomaceous earth.
  • Filter medium - The material used in filters designed to remove suspended particles as water flows through it.
  • Flowrate - The volume of water that flows past a designated point in a specified time.It is also known as gallons per minute or gpm.
  • Geometric Pools - Considered as a traditional pool, a geometric pool has even lines and features and is usually rectangular in shape.
  • Gutter - A trough situated at the edge of swimming pools for water and debris overflow.
  • Hard Water - The result when a water is high in magnesium, calcium, or other salts.Hard water makes soaps to lather.
  • Hypochlorite - Family of chlorine used to disinfect, oxidize, and sanitize pool water such as sodium, calcium, and lithium.
  • In-floor Cleaning System - A type of pool cleaning system that automatically cleans and uses a system of pop - up nozzles powered by an electrical motor.
  • Indoor Pools - A pool that is housed within a structure versus an outdoor pool that has no roof.
  • Ionizer - A sanitizing device attached on your return line that generates charged metal ions like copper or silver.Copper possesses algaecide properties while silver is bactericide.
  • Jet Pump - A electrical device used to increase water pressure to the jets.It is normally used in spas.
  • Laterals - Capped and elongated nipples slotted at the bottom of a sand filter to allow water passage while keeping the sand in the filter tank.
  • Leaf Net - A net attached to a pole used to remove floating elements such as leaves and insects from the water 's surface.
  • Liner - The vinyl membrane that contains the water in some pools.
  • Marbelite - A type of pool finishing, which is a mixture of white marble dust and white cement.
  • Neutralizer - Chemical compounds used by pool owners to render chlorine or bromine harmless to ensure swimmers are not affected.
  • Oxidizer - Any compound that removes organic waste in the water without raising chlorine levels.
  • Pump - A mechanical device powered by a motor used in poolsfor hydraulic flow and pressure for filtration.A centrifugal pump is normally used for pools and hot tubs.
  • PVC Pipe - Made from poly vinyl chloride compound, a PVC pipe is a pressure pipe used by pools for water distribution.
  • Reagents - A substance used in pools to test water quality.
  • Salt Chlorination - A type of swimming pool chlorination process.Chlorine is typically lower on a salt or mineral pool using a pool chlorinator than on swimming pools using other chlorination methods.
  • Steel Fix - Steel reinforcing bars fastened together to form the structure of a swimming pool.
  • Sand Filter - A filter tank that uses sand as the filter medium.
  • Turbidity - The result of extremely fine particles that are able to pass through the filter, making the water cloudy.
  • Titration - A method used to test the alkalinity of the water through adding a drop of titrant after another until a color change is observed.
  • Underwater light - Lights used in pools to illuminate the water beneath the water 's surface.
  • Vacuum head - The head attached to a vacuum used to suction dirt on the pool 's floor.
  • Valves - A device that restricts or obstructs water flow for the purpose of hydraulics.
  • Waterline - The point where water is filled in a pool.
  • Wet Seal - A waterproofing method used to protect internal and external areas from damage.
  • Wet-edge Pools - A type of pool built to create a visual effect of water extending beyond the pool.It is also popularly known as infinity pool.
  • Zeolite - Microporous elements use in sand filters that provide filtration to 3 microns.