Zodiac DuoClear, Installation Manual And Owner'S Manual

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Use of Algaecides and Phosphate Removers
Algaecides may be used in conjunction with a DuoClear system but are usually not necessary. Use only
ammonia based or poly-quat algaecides. Do not use copper or silver-based algeacides as it will void
the Nature
2
non-stain guarantee.
Phosphate removers can also be used with a DuoClear system and may be helpful in high phosphate
regions where algae growth is a problem. High phosphate levels will cause chlorine destruction. Contact a
local pool professional for phosphate testing and removal.
The chlorine residual level, and silver and copper level delivered by the DuoClear system is the best
defense against algae and is usually all that is necessary. If algae is observed, however, brush spot
thoroughly, adjust pH, super-chlorinate with your DuoClear system or manually shock the pool water with
either liquid or granular chlorine. With extreme algae conditions, manually shocking the pool is the
best option. A chlorine residual should be measurable within 24 hours. If not, repeat shock treatment.
After shocking, check to ensure that the DuoClear system is maintaining a residual chlorine level to
prevent future algae growth.
Note: Overuse of algaecides can lead to a reduction in chlorine residual because algaecides can
negatively react with the chlorine produced by the DuoClear system. When using algaecides, always
follow manufacturer's instructions and adjust the output of the DuoClear system to maintain a residual
chlorine level.
Use of Sequestering Agents
In some areas the calcium hardness of the source water may be unusually high. High calcium hardness
can contribute to scale formation in the pool. Sequestering agents may help to prevent this by keeping
minerals in solution. Consult a pool professional about the use of sequestering agents.
Adding Salt to the Pool
Salt is lost when water is splashed out of the pool and during backwash, not through evaporation.
Adding fresh water to the pool and rainfall can also dilute the salt concentration. To maintain an optimum
concentration, salt may need to be added from time to time. Always test the salt level before adding salt.
Test the salt level at start-up or whenever the ADD SALT light comes on. The light may switch on if
the salt level is low, the water temperature is below 65° or if the cell is badly scaled.
The salt concentration should normally be around 4000 ppm. Never allow it to fall below 3000 ppm, as
this can reduce the life of the electrode.
IMPORTANT: To avoid damage to your Clearwater chlorinator, never allow salt level to exceed
13,000 ppm. Other components of your pool equipment may be damaged if the salt level is kept
above 6000 ppm. Refer to the manufacturer’s operation manual for warranty exclusions.
To determine the salt level in the pool water.
• Capture water from elbow depth in a container.
• Use a salt test strip or test meter to test the sample, or have it tested by a pool professional.