WATER CHEMISTRY
• Proper chemical balances are necessary
for sanitary bathing conditions, as well
as ensuring your heater’s long life.
• For spas, it is necessary to perform
water changes, in addition to chemical
treatment. Change the spa water every
60 days for light usage and every 30
days if usage is heavy.
• Zodiac Pool Systems, Inc. does not
warrant heat exchangers damaged by
corrosive chemical levels or excess
dissolved solids in pool or spa water.
Refer to the recommended chemical
levels, see table right. CORROSIVE WATER
CHEMISTRY VOIDS ALL WARRANTIES.
* For calcium hypochlorite, lithium hypochlorite, or sodium hypochlorite.
** For sodium dichlor, trichlor, chlorine, gas, BCDMH.
*** Start-up includes the TDS contribution of salt found in chlorine generating systems.
**** Dictated by state or local codes. Typically 100 ppm (mg/L). Some codes are higher, some are lower.
Parameter Min. Ideal Max. Pool Type
Free Chlorine (ppm or mg/L)
1.0 2.0 - 4.0 5.0 Pools, Waterparks
2.0 3.0 - 5.0 10.0 Spas
Combined Chlorine (ppm or mg/L)
0 0 0.2 Pools, Waterparks
0 0 0.5 Spas
Total Bromine (ppm or mg/L)
2.0 4.0 - 6.0 10.0 All Types
PHMB (ppm or mg/L)
30 30 - 50 50 All Types
pH
7.2 7.4 - 7.6 7.8 All Types
Total Alkalinity as CaCO
3
60 80 - 100*
100 - 120**
180 All Types
Total Dissolved Solids (ppm/ mg/L)
NA NA 1500 over
start-up***
All Types
Calcium Hardness as CaCO
3
(ppm or mg/L)
150 200-400 1000 Pools, Waterparks
100 150-250 800 Spas
Cyanuric Acid (ppm or mg/L)
0 30-50 **** All Types
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