250
A
S AVE THESE INSTRUCTIONS
(250IO) SPA (JET + HARD WATER) ENGLISH 7.5” X 10.3” PANTONE 295U 12/12/2014
English
SPA WATER CHEMISTRY AND BALANCE (continued)
Volume
Total Alkalinity
From
→
To
8.4
→
7.2
7.8
→
7.2
210 gal
(800 L)
120 ppm
0.028 qt
0.019 qt
26 mL
18 mL
80 ppm
0.018 qt
0.013 qt
18 mL
12 mL
Lowering pH
Lowering pH Using Muriatic Acid
Volume
Total Alkalinity
From
→
To
8.4
→
7.2
7.8
→
7.2
210 gal
(800 L)
120 ppm
0.071 Lb
0.047 Lb
32 g
21 g
80 ppm
0.047 Lb
0.032 Lb
21 g
14 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
210 gal
(800 L)
120 ppm
0.541 Lb
243 g
80 ppm
0.361 Lb
163 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 89 g or 0.197 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.
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