344
PO
S AVE THESE INSTRUCTIONS
(344PO) SPA (JET + BUBBLE) ENGLISH 7.5” X 10.3” PANTONE 295U 07/20/2019
English
Page 24
SPA WATER CHEMISTRY AND BALANCE (continued)
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.
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