Intex Quick-Fill AP620-3 Owner's Manual page 31

SPA WATER CHEMISTRY AND BALANCE (continued)
Raising pH
Volume
210 gal
(800 L)
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
Desired level:
100 ppm
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.
Muriatic acid is a caustic chemical and liquid solution of sodium bisulfate (NaHSO
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.
S AVE THESE INSTRUCTIONS
(251IO) SPA (JET + HARD WATER + SANITATION) ENGLISH 7.5" X 10.3" PANTONE 295U 07/22/2014
Raising pH Using Sodium Bicarbonate
Total Alkalinity
120 ppm
80 ppm
Calcium Hardness Adjustment
Lowering Calcium Hardness Using Soft Water
1000 ppm 500 ppm
Water Volume Ratio (Vhard water:Vsoft water)
1:9 1:4
WARNING
English
From→To
6.8→7.2
0.541 Lb
243 g
0.361 Lb
163 g
350 ppm 250 ppm
2:5 2:3
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