Page 21
Jandy
®
Commercial Salt Chlorinator | Installation & Operation Manual
ENGLISH
4.4 Selecting Model Size
When sizing a chlorinator system for a pool or spa,
one should consider the typical and worst-case loads
on the pool/spa disinfection system. One should
account for relevant variables which impact
disinfectant demand and consumption. Following are
some common variables which affects demand for
disinfectant (such as chlorine or bromine):
–
Local code requirements
should be
consulted to know the target level (typically in
ppm such as 1 ppm free chlorine) and ensure
compliance with the minimum level of residual
disinfectant in the water.
–
Bather load.
The sanitizer demand increases
as the number of bathers increase.
–
Exposure to vegetation and airborne debris.
Dense landscaping increases nitrates which
introduce nitrogen. These nitrogen compounds
react with chlorine and consume it, thereby
reducing chlorine available for disinfection and
maintenance of sanitation.
–
Aeration, splashing, straying of water, and
features such as waterfalls.
These things
increase the demand for sanitizer by creating
very high and air mixing.
–
Surface area.
A larger surface area enables
more disinfectant consumption. Use of a
pool or spa covers help to minimize air/water
mixing and introduction of debris.
–
Volume.
Greater volume dilutes the
disinfectants.
–
Average water temperature.
The demand for
sanitizer changes as the temperature increases
or decreases.
–
Amount of direct sunlight/UV exposure.
Sunlight exposure increases the rate at which
sanitizer is consumed; indoor pools may be
unaffected by this factor.
–
Level of cyanuric acid (CYA) in water.
CYA slows down the destruction of chlorine by
the sun’s ultraviolet rays, but excessive CYA
levels negatively affect the oxidation ability of
chlorine.
–
Chemical dilution due to rainfall,
backwashing, etc.
The loss of water
containing sanitizer also creates loss of
sanitizer.
–
Pump and filter runtime.
Sanitizer is only
introduced when the pump is running and water
is being circulated, otherwise no disinfectant is
being circulated into the body of water.
–
Circulation patterns and speeds within the
pool, spa, or wave pool.
If the pump speed
is reduced (or turned off) to save electrical
energy the is a decreased or elimination of
filtration and introduction of disinfectant into
the water. When the pump speed is increased
or turned on, chlorine demand may be
increased.
If the disinfectant level falls below that which is
required by the local jurisdiction having authority, the
operator may need to manually add disinfectant and
other adjustment chemicals to quickly adjustment
chemicals to quickly adjust the water chemistry
levels to meet the requirement.
General guidelines for Pool Size
**
Chlorine generators should be capable of supplying
no less than 3 lbs. (1.4 kg) of chlorine per day, per
10,000 gallons (37,8 KL).
General guidelines for Spa Size
**
Chlorine generators should be capable of supplying
no less than 3 lbs. (1.4 kg) of chlorine per day, per
1,000 gallons (3.8 KL).
** These guidelines are provided as general
guidelines only. Every pool and spa system is
unique, and all considerations described in the
New Installation
section must be considered when
sizing a chlorinator for your pool or spa system.
4.5 Chemistry You Need to Know
–
Chlorine Stabilizer
(cyanuric acid) may be
needed to maintain proper levels of chlorine.
Most unstable chlorine is destroyed by the UV
radiation from the sun within 2 hours. When
used, cyanuric acid levels shall not exceed
100 ppm. Follow all local, State, and Federal
code requirements for minimum and maximum
chlorine residual levels when using cyanuric
acid.
–
Metals
(some metals) can cause loss of
chlorine. Also, metals can stain your pool.
Have your local pool professional check for
metals and recommend methods of removal.