Intex SimpleSpa SB-B10 Owner's Manual page 16

SPA WATER CHEMISTRY AND BALANCE
Free Chlorine
pH
Total Alkalinity (TA)
Calcium Hardness (CaCO
Saturation Index (SI)
Water Temperature
Free chlorine: is the chlorine residual present in the spa water.
Result if too low – Inadequate level of disinfection.
Result if too high – cause odor problem, skin & eye irritation, corroded metals and other materials.
pH: a value that indicates how acidic or basic the spa water is.
Result if too low – Corroded metals, eye & skin irritation, and destruction of total alkalinity.
Result if too high – Scale formation, cloudy water, shorter filter/heater runs, eye & skin irritation, poor chlorine
efficiency.
Total Alkalinity (TA): indicates the degree of the water's resistance to pH change. It determines the speed
and ease of pH change, so always adjust total alkalinity before adjusting the pH level.
Result if too low – Corroded metals, eye & skin irritation. Low alkalinity will cause the pH to be unstable.
Result if too high – Scale formation, cloudy water, shorter filter/heater runs, eye & skin irritation, high chlorine
demand.
Calcium Hardness (CaCO ): refers to the amount of calcium and magnesium dissolved in the water.
3
Result if too low – Difficulty balancing water, corrosion of metal components, eye & skin irritation and water
foaming.
Result if too high – Scale formation, cloudy water, eye & skin irritation, difficulty balancing water and filter/
heater inefficiency.
Saturation Index (SI): temperature, calcium hardness concentration, total alkalinity and pH represent the
main factors influencing scale formation. The tendency of water to either form scale or corrode is indicated by
the Saturation Index (SI):
*Where: TF = Temperature Factor; CF = Calcium Hardness Factor; AF = Total Alkalinity Factor
Water Temperature
(ºC)
8
12
16
19
24
29
34
40
--
Test the water pH, Temperature, Calcium Hardness and Total Alkalinity levels. Use the equivalent Factors in
the SI equation.
SI = 0, Balance
If SI > 0, Scaling or cloudy water condition.
If SI < 0, Corrosive to metals or eye & skin irritating condition.
The SI is considered satisfactory if the value is within -0.3 to +0.3 range. Zero being perfect.
S AVE THESE INSTRUCTIONS
Preferred Water Chemistry Reading
Minimum
2 ppm
7.2
60 ppm
) 100 ppm
3
–0.3
20ºC / 68ºF
SI = pH+TF+CF+AF-12.1
Calcium
TF
Hardness (ppm)
(ºF)
46 0.2 75
54 0.3 100
61 0.4 150
66 0.5 200
75 0.6 250
84 0.7 300
93 0.8 400
104 0.9 500
-- -- 1000
(348PO) SPA ENGLISH 7.5" X 10.3" PANTONE 295U 10/25/2019
Ideal
2 - 4 ppm
7.2 - 7.6
80 ppm
150–250 ppm
0
20–40ºC / 68–104ºF
Total
CF
Alkalinity (ppm)
1.5 50
1.6 75
1.8 100
1.9 150
2.0 200
2.1 300
2.2 400
2.3 --
2.6 --
348
English
PO
Maximum
5 ppm
7.8
120 ppm
350 ppm
+0.3
40ºC / 104ºF
AF
1.7
1.9
2.0
2.2
2.3
2.5
2.6
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Page 16