Instruction Manual

346
PO
S AVE THESE INSTRUCTIONS
(346PO) SPA ENGLISH 7.5” X 10.3” PANTONE 295U 08/10/2019
English
Page 21
SPA WATER CHEMISTRY AND BALANCE (continued)
Lowering pH Using Sodium Bisulfate
Calcium Hardness Adjustment
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 1000 ppm 500 ppm 350 ppm 250 ppm
Desired level:
100 ppm
Water Volume Ratio
(Vhard water:Vsoft water)
1:9 1:4 2:5 2:3
Lowering Calcium Hardness Using Soft Water
Raising pH
Raising pH Using Sodium Bicarbonate
WARNING
Muriatic acid is a caustic chemical and liquid solution of sodium bisulfate (NaHSO
4
)
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.
Lowering pH
Lowering pH Using Muriatic Acid
Volume 210 gal (795 L) 290 gal (1098 L)
Total Alkalinity 120 ppm 80 ppm 120 ppm 80 ppm
From→To
8.4→7.2
0.028 qt 0.018 qt 0.038 qt 0.025 qt
26 mL 18 mL 36 mL 24 mL
7.8→7.2
0.019 qt 0.013 qt 0.026 qt 0.017 qt
18 mL 12 mL 22 mL 16 mL
Volume 210 gal (795 L) 290 gal (1098 L)
Total Alkalinity 120 ppm 80 ppm 120 ppm 80 ppm
From→To
8.4→7.2
0.071 Lb 0.047 Lb 0.095 Lb 0.063 Lb
32 g 21 g 43 g 29 g
7.8→7.2
0.047 Lb 0.032 Lb 0.064 Lb 0.043 Lb
21 g 14 g 29 g 20 g
Volume 210 gal (795 L) 290 gal (1098 L)
Total Alkalinity 120 ppm 80 ppm 120 ppm 80 ppm
From→To 6.8→7.2
0.541 Lb 0.361 Lb 0.737 Lb 0.491 Lb
243 g 163 g 335 g 224 g
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 210 gal (795 L) 290 gal (1098 L)
m (CaCl
2
) 0.197 Lb 89 g 0.269 Lb 122 g