Water Chemistry - Hayward Salt & Swim Manuel D'utilisation

Water Chemistry

The table below summarizes the levels that are recommended by The Association of Pool and Spa
Professionals (APSP). It is important to maintain these levels in order to prevent corrosion or scaling
and to ensure maximum performance from your Salt & Swim chlorine generator. Have your water
tested or use pool water test strips and refer to the Chemistry Quick Start Guide information on testing
and adjusting your pool's water chemistry. Your Authorized Salt & Swim Dealer or most pool stores
can provide you with the chemicals and procedures to adjust the water chemistry as well.
Note that pool water emanating from wells and municipal water supplies, along with the introduction
of environmental contaminants, can contain chemistries that are deleterious to the life expectancy
of the Cell.
Salt
Free Chlorine
pH
Cyanuric Acid
(Stabilizer)
Total Alkalinity
Calcium Hardness
Metals
Saturation
Saturation index
The saturation index (Si) relates to the calcium and alkalinity in the water and is an indicator of the
pool water "balance". Your water is properly balanced if the Si is 0 ±.2. If the Si is below -0.2, the
water is corrosive and plaster pool walls will be dissolved into the water. If the Si is above +0.2,
scaling and staining will occur. Use the chart below to determine the saturation index.
8
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
CHEMICAL
2700 to 3400 ppm
1.0 to 3.0 ppm
7.2 to 7.6
20 to 30 ppm (if necessary)
80 to 120 ppm
125 to 250 ppm
0 ppm
-.2 to .2 (0 best)
Index
Si = pH + Ti + Ci + Ai - 12.1
ºC ºF Ti
12 .3
53
16 .4
60
19 .5
66
24 .6
76
29 .7
84
34 .8
94
39 .9
103
How to use: Measure pool pH, temperature, calcium hardness,
and total alkalinity. Use the chart above to determine Ti, Ci,and
Ai from your measurements. Insert values of pH, Ti, Ci and Ai
into the above equation. If Si equals .2 or more, scaling and
staining may occur. If Si equals -.2 or less corrosion or irritation
may occur.
CORROSIVE
IDEAL LEVELS
Total
Calcuim
Ci
Alkalinity
Hardness
1.5
75 75
1.6
100 100
125 1.7 125
150 1.8 150
1.9
200 200
2.0
250 250
300 2.1 300
400 2.2 400
2.4
600 600
2.5
800 800
-.2
0 .2
OK
Ai
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.8
2.9
SCALING