Tiny plants which grow in the water and can discolor it.
Chemicals which kill algae and prevent new algae growth.
Microscopic organisms (germs) which can cause illness.
Chemicals that combine with dissolved metals to prevent water
The combined form of chlorine after oxidation of impurities. Cause
eye irritation and four chlorine-like odors. This form of chlorine
is not an effective disinfectant.
The most commonly used disinfecting agent for swimming pools because
it is the best chemical material available.
The materials in the water which use up chlorine, such as bacteria,
algae, dirt, leaves, grass clippings and swimmers wastes. The
chlorine demand must be satisfied before a chlorine residual is
available to disinfect the pool water.
The chlorine level in the water after the chlorine demand has been
satisfied. The free chlorine residual is the true measure of
potential chlorine disinfection.
(See stabilizer. Also called conditioner)
indicator solution used to measure the free chlorine residual.
(Sodium bisulfate) A granular material which is used to lower the pH
or total alkalinity.
Hypochlorous acid or hypochlorite. This is the active chlorine that
kills bacteria and algae and keeps your pool clear and clean.
The amount of calcium or magnesium dissolved in the water. High
levels contribute to scale deposits.
The active form of chlorine in water. The material which performs
the sanitizing and oxidizing. (free chlorine)
A liquid used for lowering pH or total alkalinity.
orthotolidine. And outdated indicator solution that was used to
measure the total chlorine residual.
system for measuring the acidity/alkalinity of water. Readings above
7 are alkaline; readings below 7 are acidic.
per million, the standard measure of concentration in swimming
pools. An example is one penny in $10,000.
The indicator solution which measures pH.
(Cyanuric acid or conditioner) s-triazinetrione, also called
Isocyanuric Acid. A chemical which helps prolong the useful life of
chlorine in the water by slowing down chlorine decay due to
(Shock treatment) The practice of adding 5-10 times the normal daily
chlorine dose to destroy algae, or to prevent problems after heavy
bather loads or severe rains.
This helps the water resist changes in pH.
The sum of the amount of free chlorine and combined chlorine.