Intex PureSpa Mode D'emploi page 17

SPA WATER CHEMISTRY AND BALANCE (continued)
How to adjust the spa water chemistry when the levels are off the range.
CAUTION: Always follow the chemical manufacturer's directions, and the health and hazard warnings.
Remove the spa cover to aerate the water and use the included test strips to check the chemistry level.
Ensure the chlorine level in the water is between 2-4 ppm fi rst, as chlorine will affect the TA test result.
If the TA level (and not the pH) is higher than 120 ppm, to lower the TA level, you add muriatic acid (hydrochloric
acid) or sodium bisulfate.
If the TA level is lower than 60 ppm, you add sodium bicarbonate.
For example (for 4 adults), if the TA level is 180 ppm, the desired decrease is 60 ppm, from below chart, you
need to add 0.269 Lb (121 g) of sodium bisulfate or 0.101 qt (96 ml) of muriatic acid.
If the test strip color is between 180 ppm and 240 ppm, and close to 180 ppm, you can also add 0.269 Lb
(121 g) of sodium bisulfate or 0.101 qt (96 ml) of muriatic acid.
If the reading is more than 240 ppm, you can add sodium bisulfate or muriatic acid to the water drop by drop
until the test strip indicates a 240 ppm reading, then add 0.528 Lb (238 g) of sodium bisulfate or 0.202 qt
(192 ml) of muriatic acid.
NOTE: After adjustment, retest the water after 24 hours and adjust again if necessary.
Lowering Total Alkalinity
Amount of Sodium Bisulfate to lower Total Alkalinity
Desired level
Volume:
210 gal / 795 L
Volume:
290 gal / 1098 L
Desired level
Volume:
210 gal / 795 L
Volume:
290 gal / 1098 L
Raising Total Alkalinity
Amount of Sodium Bicarbonate to raise Total Alkalinity
Desired level
Volume:
210 gal / 795 L
Volume:
290 gal / 1098 L
After the total alkalinity has been lowered to 120 ppm or raised to 80 ppm and the pH is still high or low, you
can adjust it using the following chart.
S AVE THESE INSTRUCTIONS
SPA Water Adjustment
Total Alkalinity (TA) Adjustment
60 ppm 80 ppm
0.269 Lb 0.358 Lb
121 g 161 g
0.368 Lb 0.492 Lb
168 g 224 g
Amount of Muriatic Acid to lower Total Alkalinity
60 ppm 80 ppm
0.101 qt 0.135 qt
96 mL 128 mL
0.139 qt 0.185 qt
132 mL 176 mL
20 ppm 40 ppm
0.059 Lb 0.118 Lb
27 g 53 g
0.081 Lb 0.162 Lb
37 g 74 g
pH Adjustment
(295IO) SPA ENGLISH 7.5" X 10.3" PANTONE 295U 11/06/2017
100 ppm 120 ppm 140 ppm
0.448 Lb 0.528 Lb 0.627 Lb
202 g 238 g 283 g
0.614 Lb 0.737 Lb 0.860 Lb
279 g 335 g 391 g
100 ppm 120 ppm 140 ppm
0.169 qt 0.202 qt 0.234 qt
160 mL 192 mL 223 mL
0.232 qt 0.278 qt 0.324 qt
220 mL 264 mL 308 mL
(Muriatic acid: 31.45%)
60 ppm 80 ppm
0.178 Lb 0.237 Lb
80 g 107 g
0.244 Lb 0.326 Lb
111 g 148 g
295
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