MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
60
CHEMICAL BALANCE,
(continued)
It is wise to test pool water regularly. Never allow chlorine residual to drop below 0.6 ppm (parts per million). The
minimum level for effective chlorine or bromine residual is 1.4 ppm.
pH
- The term pH refers to the acid/alkaline balance of
water expressed on a numerical scale from 0 to 14. A test kit for measuring pH balance of your pool water is available from your local
pool supply store; see Table 10.
Muriatic Acid
has a pH of about 0. Pure water is 7 (neutral). Weak Lye solution have a pH of 13-14.
RULE:
7.4 to 7.6 is a desirable pH range. It is essential to maintain correct pH, see Table 11.
If pH becomes too high (over alkaline), it has these effects:
1. Greatly lowers the ability of chlorine to destroy bacteria and algae.
2. Water becomes cloudy.
3. There is more danger of scale formation on the plaster or in the heat exchanger tubing.
4. Filter elements may become blocked.
If pH is too low (over acid) the following conditions may occur:
1. Excessive eye burn or skin irritation.
2. Etching of the plaster.
3. Corrosion of metal fixtures in the filtration and recirculation system, which may create brown, blue, green, or sometimes almost
black stains on the plaster.
4. Corrosion of copper tubes in the heater, which may cause leaks.
5. If you have a sand and gravel filter, the alum used as a filter aid may dissolve and pass through the filter.
CAUTION: Do not test for pH when the chlorine residual is 3.0 ppm or higher, or bromine residual is 6.0 ppm
or higher. See your local pool supply store for help in properly balancing your water chemistry.
RULE
: Chemicals that are acid lower pH. Chemicals that are alkaline raise pH.
ALKALINITY High or Low:
“Total alkalinity” is a measurement of the total amount of alkaline chemicals in the water, and control pH to a great degree. (It is not
the same as pH which refers merely to the relative alkalinity/acidity balance.) Your pool water’s total alkalinity should be 100 - 140
ppm to permit easier pH control. A total alkalinity test is simple to perform with a reliable test kit. You will need to test about once
a week and make proper adjustments until alkalinity is in the proper range. Then, test only once every month or so to be sure it is
being maintained. See your local pool dealer for help in properly balancing the water chemistry.
WATER CHEMISTRY PARAMETERS
Disinfectant levels
Minimum
Ideal
Maximum
Free Chlorine, ppm
1.0
2.0-3.0
4.0
Salt, ppm
2000
3200
5000
Combined Chlorine, ppm
None
None
0.2
Bromine, ppm
2.0
4-6
10.0
Other Sanitizers
Levels not established. Consult local health department before use.
Chemical Values
pH
7.2
7.4-7.6
7.8
Total Alkalinity (Buffering), ppm
60
80-100
180
as CaCO3
Total Dissolved Solids, ppm
N/A
N/A
1,500 ppm > TDS at startup*
Calcium Hardness, ppm, as CaCO3
150
200-400
500
Heavy Metals
None
None
None
Biological Values
Algae
None
None
None
Bacteria
None
None
Refer to Local Cod
e
NOTICE:
Failure to adhere to the listed water chemistry parameters may result in premature failure of the heat
exchanger and will void the warranty. *Start-up TDS includes source water TDS and any other inorganic salt added at
start-up. Note: DO NOT use a metal ionizer with the MasterTemp heater.
Section 4. Maintenance
Table 11.
