Bedienungsanleitung Intex PureSpa SJB-HS-20 (Seite 17 von 27) (Englisch)

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S AVE THESE INSTRUCTIONS

(264IO) SPA (JET + BUBBLE) ENGLISH 7.5” X 10.3” PANTONE 295U 10/07/2015

English

Page 17

Calcium Hardness (CaCO3): refers to the amount of calcium and magnesium dissolved in the water.

Result if too low – Difﬁ culty balancing water, corrosion of metal components, eye & skin irritation and water

foaming.

Result if too high – Scale formation, cloudy water, eye & skin irritation, difﬁ culty balancing water and ﬁ lter/

heater inefﬁ ciency.

Saturation Index (SI): temperature, calcium hardness concentration, total alkalinity and pH represent the

main factors inﬂ uencing scale formation. The tendency of water to either form scale or corrode is indicated by

the Saturation Index (SI):

SI = pH+TF+CF+AF-12.1

*Where: TF = Temperature Factor; CF = Calcium Hardness Factor; AF = Total Alkalinity Factor

SPA WATER CHEMISTRY AND BALANCE (continued)

Water Temperature TF Calcium

Hardness (ppm) CF Total

Alkalinity (ppm) AF

(ºC) (ºF)

8 46 0.2 75 1.5 50 1.7

12 54 0.3 100 1.6 75 1.9

16 61 0.4 150 1.8 100 2.0

19 66 0.5 200 1.9 150 2.2

24 75 0.6 250 2.0 200 2.3

29 84 0.7 300 2.1 300 2.5

34 93 0.8 400 2.2 400 2.6

40 104 0.9 500 2.3 -- --

-- -- -- 1000 2.6 -- --

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.

SPA Water Adjustment

How to adjust the spa water chemistry when the levels are off the range. CAUTION: Always follow the

chemical manufacturer’s directions, and the health and hazard warnings.

Total Alkalinity (TA) Adjustment

Remove the spa cover to aerate the water and use the included test strips to check the chemistry level.

Ensure the chlorine level in the water is between 2-4 ppm ﬁ rst, as chlorine will affect the TA test result.

If the TA level (and not the pH) is higher than 120 ppm, to lower the TA level, you add muriatic acid (hydrochloric

acid) or sodium bisulfate.

If the TA level is lower than 60 ppm, you add sodium bicarbonate.

For example (for 4 adults’), if the TA level is 180 ppm, the desired decrease is 60 ppm, from below chart, you

need to add 0.269 Lb (121 g) of sodium bisulfate or 0.101 qt (96 ml) of muriatic acid

If the test strip color is between 180 ppm and 240 ppm, and close to 180 ppm, you can also add 0.269 Lb

(121 g) of sodium bisulfate or 0.101 qt (96 ml) of muriatic acid.

If the reading is more than 240 ppm, you can add sodium bisulfate or muriatic acid to the water drop by drop

until the test strip indicates a 240 ppm reading, then add 0.528 Lb (238 g) of sodium bisulfate or 0.202 qt

(192 ml) of muriatic acid.

NOTE: After adjustment, retest the water after 24 hours and adjust again if necessary.

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