What do pool test strips test for? （1）

Free Chlorine  

ppm (mg/L)

0-2

0-10

pool：0.3-0.6

pool：0.5-1

pool：1-3

spa：2-3

spa：3-5

A sanitizer which keeps your pool water safe and free of germs.

Total Alkalinity

ppm

0-240；

0-360

80-120

Keep the pH in balance.

pH                         

6.0-9.0;

6.2-8.2；

6.6-8.4

7.2-7.8

7.0-7.4

7.4-7.6

Needs to be kept in balance to prevent irritation and protect the pool equipment.

Total Hardness

ppm

0-425；

0-1000

200-400

250-500

100

Appropriate levels help prevent plaster damage. High levels can cause calcium scaling. Low levels can dissolve plaster walls and corrode metal fixtures.

Hardness level also affects pH.

Cyanuric Acid 

ppm

0-150；

0-240

30-50 US

30-100

50-100 UK

100 AUS

Protects chlorine from sunlight and determines the required FC level.

Total Chlorine

ppm(mg/L)

0-10

0-20

1-3

Total chlorine is the sum of free chlorine and combined chlorine. If total chlorine is greater than free chlorine, it indicates that the pool water contains too much chlorine and needs a shock to balance it.

Bromine

ppm

0-10

0-20

1-2

2-6

Bromine is most commonly used to disinfect spas and hot tubs because it is more stable than chlorine.