Suggested NSPI Standards - Swimming Pools
Free Chlorine, ppm


1.0


1.0-3.0
3.0
Combined chlorine, ppm 
None


None

0.2
Bromine, ppm 



2.0


2.0-4.0

4.0
Total Alkalinity, ppm

80


80-100
180

(for Liquid Chlorine, Cal-Hypo and Lithium Hypo)

(for gas chlorine, dichlor, trichlor and bromine compounds)
TDS,ppm




300


1000-2000
3000
Calcium Hardness, ppm
250

250-400
500-1000+
Cyanuric Acid, ppm


30


30-50

150


(except where limited by Health Dept. requirements, often to 100 ppm)
Suggested NSPI Standards - Spas
- Free Chlorine, ppm



1.0


1.0-3.0
10.0
- Combined chlorine, ppm

None


None
0.2
- Bromine, ppm




2.0


2.0-4.0
10.0
- Total Alkalinity, ppm



80


80-100
180

(for Liquid Chlorine, Cal-Hypo and Lithium Hypo)

(for Gas Chlorine, Dichlor,Trichlor and Bromine Compounds)
- TDS,ppm






300

1000-2000
3000
- Calcium Hardness, ppm


250

250-400
500-1000+
- Cyanuric Acid, ppm


10


30-50

150