17
Determine Amount of Salt Required
(and salt level to maintain)
...
•
The ideal salt range is 3000 -
4
500 PPM (2500 minimum) (2.5 - 3.5 g/l).
However, if so desired, the DIG-220
can
operate with salt levels in excess of 35,000 PPM (35.0 g/l).
•
Salt levels above 6000 PPM are not normally recommended, as corrosion issues may result. Salt levels below 2400 ppm will
reduce the
efficiency of the DIG-220 and will
result
in low chlorine production.
•
Extremely low salt levels (below 1900 ppm) will activate the low salt safety cut off, and will halt chlorine production
until salt is
replenished to proper levels
.
•
Once the DIG-220 is programmed to the pool water volume, the controller will automatically indicate how much salt is req
uired to
attain ideal salt levels.
Additionally,
ple
a
se
see the reference table, on
page-24
for information on amount of salt to be added relative to the gallons of water to be treated vs existing salt level.
Type of Salt to Add...
•
It is important to use Sodium Chloride (NaCl) salt that is greater than 99% pure.
•
Acceptable types of salt include granular food grade, water softener pellets, or solar salt flakes; these are usually availa
ble in 25
-lb (13 kg) to 80-lb (36 kg) bags at local
pool
or building supply outlets.
•
Water softener and solar salt will have a slower dissolve rate than food grade salt. Rock salt and Granular Salt with Iodine
or Rust pr
eventatives should
not be used, as
these
mixtures contain high levels of impurities and will cause staining
.
Note
:
While not recommended, granular salt containing anti-caking additives such as YPS (Yellow Prussiate of Soda) or Sodium Ferrocyanid
e
can
be used. However, these mixtures—
if not mixed and dissolved immediately— may cause a localized tint to the water or yellow staining of the pool/spa finish.
Adding Salt:
FIRST... Test the water for current salt content !!!
PREPARING THE POOL WATER
Steps to Prepare Water:
1.
Calculate Pool Volume:
See next section, below.
2.
Adjust Water Chemistry:
(Via saturation index... consider pH,
total
alkalinity, hardness, and water temperature; also adjust stabilizer level). See Reference section, page-25 & 26.
3.
Add Initial Chlorine Dosage:
Use liquid chlorine (sodium hypochlorite), or available types o
f tablet
or granular chlorine as obtained from pool supply, to achieve 1-3 ppm free chlorine.
4.
Add salt to water (test the water for salt level, first).
Adjust to 3000 ppm. See salt chart on page-24.
5.
Enter pool volume Information into DIG-220:
See “Pool Volume” programming on page-22.
Calculating Pool Volume:
When properly sized to the site, the DIG-220 will meet the sanitizer “maintenance” requirements of the pool/spa. The DIG-220 is
not des
igned to chlorine shock treat, or build
up
a chlorine residual, when starting with a zero or very low chlorine level.
Before starting the DIG-220, the water must be properly balanced, and the chlorine l
evel
must
be adjusted to between 1-to-3 ppm free chlorine. More on adjusting water
balance,
and start-up chlorine levels, follows below.
Installer Please Note:
Liters (pool size measured in meters)
= Length x Width x Average Depth x 1000
= Diameter x Diameter x Average Depth x 785
= Length x Width x Average Depth x 785
Rectangular
Round
Oval
Rectangular
Round
Oval
Gallons (pool size measured in feet)
= Length x Width x Average Depth x 7.5
= Diameter x Diameter x Average Depth x 5.9
= Length x Width x Average Depth x 5.9
depth of deep end + depth of shallow end
2
Average Depth =
Calculated pool volume is:
Enter Pool Volume figure in the information section, page-4.
FIG-18
How to add the salt (or remove it if too much)...
•
The object is to have the
salt
fully
dissolve into the water.
•
Add salt directly to pool (or spa, if a spa-only installation), and over the main drain (If main drain is present). If t
here is no main
drain, a vacuum head may be used to
encourage
salt circulation. Start the water circulation pump and set to run continuously for 24 hours to properly dissolve salt.
•
Distributing the salt through brushing is also helpful; brush the salt toward the main drain (if one is present). Set pump
operation
to normal run time after salt has fully
dissolved
into water.
•
If the salt level becomes undesirably high, the only way to remove excess salt is to partially drain the pool/spa and r
efill it with fresh
water.
Add Salt to Pool Water...
NOTICE
Do not use a pool cleaner or vacuum head with wheels, as wheels can leave
track marks on newly
plastered pools. Do not allow Granular salt to pile up
in
one location, without brushing, as
sta
ining may occur.
Failure to heed the following may result in equipment damage.
