Color card:
Free Chlorine
Recommended range 1 - 3 ppm
Low - Add chlorine.
High - Allow sunlight to burn up chlorine.
0
Very low
0.5
Low
1
Ideal
3
Ideal
6
High
9
Very high
Total Alkalinkity
Recommended range 80 - 120 ppm
Low - Add AlkalinityUp.
High - Add acid.
0
Very Low
40
Low
80
Ideal
120
Ideal
180
High
240
Very high
pH
Recommended range 7.2 - 7.6
Low - Add AlkalinityUp.
High - Add acid.
6.2
Very Low
6.8
Low
7.2
Ideal
7.6
Ideal
8
High
8.4
Very high
Stabiliser CYA
Don't exceed 50 ppm
Low -
High - Backwash and fill with fresh water.
0
Ideal
50
Ideal
100
High
150
Very High
200
Excessive