NSPF Recommended Water Chemistry

NSPF Recommended Water Chemistry

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 CaCO3
(ppm or mg/L)
60 80-100*
100-120**
180 All Types
Total Dissolved Solids
(ppm or mg/L)
NA NA 1,500 over start-up*** All Types
Calcium Hardness CaCO3
(ppm or mg/L)
150 200-400 1,000 Pools, Waterparks
100 150-250 800 Spas
Heavy Metals None None None All Types
Visible Algae None None None All Types
Bacteria None None Local Code All Types
Cyanuric Acid
(ppm or mg/L)
None None Local Code All Types
Temperature ℉/℃ 78 ℉ (25.5 ℃) 80.5 ℉ (26.9 ℃) 82 ℉ (27.8 ℃) Competition, Pools
- - 104 ℉ (40 ℃) Spas
- Personal Preference 104 ℉ (40 ℃) Other Pools
Ozone
(ppm or mg/L)
- - 0.1 Over 8-hr. time wtd. avg All Types
ORP Calibrate to Disinfectant Level ***** All Types

*      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)

*****  Some state or local codes may dictate a minimum and maximum