Intex PureSpa SB-HW10 Owner's Manual page 21

SPA WATER CHEMISTRY AND BALANCE (continued)
Lowering pH
Volume
Total Alkalinity
From→To
Volume
Total Alkalinity
From→To
Raising pH
Volume
Total Alkalinity
From→To
Use the included test strips to check the water hardness level and adjust it following below chart.
Lowering Calcium Hardness
If your household water supply is treated with a softener, mix the spa hard water with the soft water
according to the water volume ratio chart to lower the calcium hardness:
Initial level
Desired level:
100 ppm
Raising Calcium Hardness
If the calcium hardness level in the spa water is lower than 100 ppm, add calcium chloride into the spa
water.
Volume
m (CaCl
Muriatic acid is a caustic chemical and liquid solution of sodium bisulfate (NaHSO
is highly acidic. Handle all chemicals with care and wear extra personnel protective
equipment including goggle and gloves. It is very important not to splash acid onto
your skin or clothing, or into your eyes.
S AVE THESE INSTRUCTIONS
Lowering pH Using Muriatic Acid
210 gal (795 L)
120 ppm
0.028 qt 0.018 qt
8.4→7.2
26 mL
0.019 qt 0.013 qt
7.8→7.2
18 mL
Lowering pH Using Sodium Bisulfate
210 gal (795 L)
120 ppm
0.071 Lb 0.047 Lb
8.4→7.2
32 g
0.047 Lb 0.032 Lb
7.8→7.2
21 g
Raising pH Using Sodium Bicarbonate
210 gal (795 L)
120 ppm
0.541 Lb 0.361 Lb
6.8→7.2
243 g
Calcium Hardness Adjustment
Lowering Calcium Hardness Using Soft Water
1000 ppm 500 ppm
Water Volume Ratio (Vhard water:Vsoft water)
1:9 1:4
210 gal (795 L)
) 0.197 Lb
2
WARNING
(346PO) SPA ENGLISH 7.5" X 10.3" PANTONE 295U 08/10/2019
290 gal (1098 L)
80 ppm 120 ppm 80 ppm
0.038 qt 0.025 qt
18 mL 36 mL
0.026 qt 0.017 qt
12 mL 22 mL
290 gal (1098 L)
80 ppm 120 ppm 80 ppm
0.095 Lb 0.063 Lb
21 g 43 g
0.064 Lb 0.043 Lb
14 g 29 g
290 gal (1098 L)
80 ppm 120 ppm 80 ppm
0.737 Lb 0.491 Lb
163 g 335 g
350 ppm 250 ppm
2:5
290 gal (1098 L)
89 g 0.269 Lb
346
English
PO
24 mL
16 mL
29 g
20 g
224 g
2:3
122 g
)
4
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