Replication No.

Mean

% mean removal

1

2

3

Before

After

Before

After

Before

After

before

After

Cu (mg/l)

0.12

0.02

0.08

0.00

0.03

0.01

0.0767

0.01

−87%

Zn (mg/l)

2.30

0.20

3.72

0.21

5.06

0.73

3.69

0.38

−90%

Pb (mg/l)

Below detection limit (BDL)

BDL

BDL

BDL

BDL

BDL

BDL

BDL

-

Cr (mg/l)

BDL

BDL

BDL

BDL

BDL

BDL

BDL

BDL

-