L
Lap Pool - A long, narrow pool, usually about four feet deep for swimming laps.
Lateral - Usually a series of small perforated pipes at the base of a sand filter that forces water through the sand bed for filtration.
Leaf net - Deep net attached to the end of a multi-purpose pole the skins surface debris.
Leaf rake - Metal brush used to brush off the top of the spores and allow chlorine to penetrate and kill it.
M
Main Drain - The grate at the bottom of a pool or spa – should be equipped as a dual drain with suction or with an anti-vortex system to avoid hair of body entrapment.
Modular Media - Large capacity cartridge filter.
Muriatic acid - Dilute hydrochloric acid to lower PH level on pool water.
N
Non-chlorine shock - Does not contain chlorine but can oxidize organic waste.
O
O ring - Rubber ring used on equipment for better seal. Example, the o-ring under the main circulation pump see through lid.
Oxidation - Chemical process of burning up and eliminating ammonia compounds, nitrogen compounds and swimmer waste. A chlorine or non-chlorine shock may be used.
Ozone - Molecule containing 3 atoms of oxygen to oxidize the water. For pool sanitizing this product is called an ozonator.
