Black Algae
Black (also called blue-green) algae can appear in pools, often as small round dark spots at or near crevices, cracks, and shaded areas of the pool.
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Bather Load
Bather load is a pool industry term to describe the amount of swimmers, or bathers, in a pool at any given time or during a given time span.
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Base
Adding a base to pool water will cause the water to become more basic. Pools that contain too much of a base can cause cloudy water and pool surface scaling.
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Baking Soda
Baking soda is also called sodium bicarbonate and is used to raise the alkalinity of swimming pool water.
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Bacteria
Bacteria are small living organisms that can be found in pools, although a pool that is well sanitized should consistently keep bacteria counts below unsafe levels.
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Backwashing
Backwashing is the process of cleaning the main swimming pool filter by reversing the flow of water through the filter, dislodging filter debris and removing the debris-filled water from the pool lines, leaving a cleaned filter.
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Algaecide
Algaecides are chemicals and systems intended to kill algae growth in pool water, and prevent future algae blooms.
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Algae
Algae are small, plantlike organisms that are commonly found in swimming pool water.
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Unstabilized Chlorine
Unstabilized chlorine is a form of chlorine added to swimming pools for use as a sanitizer, but does not contain a stabilizing agent such as cyanuric acid, which increases the time chlorine can remain stable in swimming pool water.
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Stabilized Chlorine
Stabilized chlorine is chlorine normally added to swimming pool water that also contains a stabilizing agent, such as cyanuric acid, designed to slow the destruction of dissolved chlorine in swimming pool water when exposed to UV light (sunlight).