Testing And Adjusting Spa Water; Ltr20121002, Rev. A - Cal Spas LTR20121002 Owner's Manual

Testing and Adjusting Spa Water

You have two types of testing methods to choose from:
• The reagent test kit is a method which provides a high level of accuracy. It is available in either liquid
or tablet form.
• Test strips
are a convenient testing method commonly used by spa owners.
Balancing the Total Alkalinity
Total alkalinity (TA) is the measure of the total lev-
els of carbonates, bicarbonates, hydroxides, and
other alkaline substances in the water. TA can be
considered a "pH buffer". It is the measure of the
ability of the water to resist changes in pH level.
The recommended total alkalinity is 80 - 120
ppm .
If the TA is too low, the pH level will fluctuate wide-
ly from high to low. Low TA can be corrected by
adding a pH-alkalinity increaser.
If the TA is too high, the pH level will tend to be
too high and may be difficult to bring down. High
TA can be corrected by adding a pH-alkalinity de-
creaser.
When the TA is balanced, it normally remains sta-
ble, although adding water with high or low alkalin-
ity will raise or lower the TA level.
Balancing the pH
The pH level is the measure of the balance between
acidity and alkalinity.
If the pH is too low, it can cause corrosion of metal fix-
tures and the heating element. Low pH can be corrected
by adding a pH-alkalinity increaser.
If the pH is too high, it can cause scaling by allowing
metals or minerals to form deposits and stain spa sur-
faces. High pH can be corrected by adding a pH-alkalin-
ity decreaser.
Testing For:
Total Alkalinity
Calcium Hardness
pH
Inground Spas

LTR20121002, Rev. A

Ideal Range (ppm)
Minimum Maximum
80 120
150 200
7.4 7.6
Balancing the Calcium Hardness
Calcium hardness (CH) is a measure of the total
amount of dissolved calcium in the water. Calcium
helps control the corrosive nature of the spa's wa-
ter and is why soft water is not recommended. The
low calcium content of soft water is very corrosive
to the equipment and can cause staining of the spa
shell.
The recommended calcium hardness is 150
- 200 ppm .
If the CH is too low, add a calcium hardness in-
creaser.
If the CH is too high, dilute the spa water with soft
water.
When the CH is balanced, it normally remains sta-
ble, although adding soft water or very hard water
will raise or lower the CH level.
8.2
Too alkaline,
8.0
causes scaling
7.8
7.6
Ideal balance 7.4
7.2
7.0
Too acidic,
6.8
causes corrosion
6.6
Need to lower the pH level
Need to raise the pH level
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