275
A
S AVE THESE INSTRUCTIONS
(275IO) SPA (JET + HARD WATER) ENGLISH 7.5” X 10.3” PANTONE 295U 07/15/2016
English
SPA WATER CHEMISTRY AND BALANCE (continued)
Volume
Total Alkalinity
From
→
To
8.4
→
7.2
7.8
→
7.2
290 gal
(1098 L)
120 ppm
0.038 qt
0.026 qt
36 mL
22 mL
80 ppm
0.025 qt
0.017 qt
24 mL
16 mL
Lowering pH
Lowering pH Using Muriatic Acid
Volume
Total Alkalinity
From
→
To
8.4
→
7.2
7.8
→
7.2
290 gal
(1098 L)
120 ppm
0.095 Lb
0.064 Lb
43 g
29 g
80 ppm
0.063 Lb
0.043 Lb
29 g
20 g
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
Volume
Total Alkalinity
From
→
To
6.8
→
7.2
290 gal
(1098 L)
120 ppm
0.737 Lb
335 g
80 ppm
0.491 Lb
224 g
Raising pH
Raising pH Using Sodium Bicarbonate
Raising Calcium Hardness
If the calcium hardness level in the spa water is lower than 100 ppm, add 122 g or 0.269 Lb of calcium
chloride into the spa water.
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.
Page 17
