Item

Category

Grade I
for drinking water

Grade II
(for sewage etc.,

Liquid

Solid

Liquid

Solid

Excellent

Good

Excellent

Good

(Al₂O₃)/% ≥

10.0

10.0

30.0

28.0

10.0

27.0

Basicity/%

40-85

40-85

40-90

40-90

40-90

40-90

Density(20^oC)/(g/cm³)≥

1.15

1.15

-

-

1.15

-

Indissolubility/% ≤

0.1

0.3

0.3

1.0

0.5

1.5

PH(1% solution)

3.5-5.0

3.5-5.0

3.5-5.0

3.5-5.0

3.5-5.0

3.5-5.0

(Nitrogen)/% ≤

0.01

0.01

(As)/% ≤

0.0001

0.0002

(Pb)/% ≤

0.0005

0.001

(Cd)/% ≤

0.0001

0.0002

(Hg)/% ≤

0.00001

0.00001

(Cr⁶⁺)/% ≤

0.0005

0.0005