| Water works/dam |
|
|
|
Poly-DADMAC concentration (ยตg/L) |
MeanM3/M1 |
MeanM3/M2 |
| |
|
|
Calibration technique |
| |
|
|
Method 1 (M1) |
Method 2 (M2) |
Method 3 (M3) |
Redox potential (mV) |
| Coag.a |
Dosing level:May-July(mg/L) |
n |
Mean± SD |
% RSD |
Mean± SD |
% RSD |
Mean± SD |
% RSD |
Mean± SD |
Median |
Range |
| Raw water |
| Wiggins/Inanda |
|
|
4 |
3.73 ± 0.46 |
12.30 |
4.01 ± 0.21 |
5.16 |
44.53 ± 5.51 |
12.37 |
-20 ± (18) |
-27 |
-34 to +12 |
11.9 |
11.1 |
| DV Harris/Midmar |
|
|
3 |
10.12 ± 6.94 |
68.54 |
11.22 ± 6.70 |
59.71 |
33.66 ± 40.08 |
119.07 |
-41 ± (49) |
-41 |
-76 to -6 |
3.3 |
3.0 |
| Hazelmere/Hazelmere |
|
|
3 |
6.82 ± 9.03 |
132.47 |
9.47 ± 12.41 |
131.05 |
30.77 ± 18.84 |
61.25 |
-32 ± (43) |
-25 |
-79 to +7 |
4.5 |
3.2 |
| Durban Heights/Nagel |
|
|
3 |
5.73 ± 6.57 |
114.52 |
6.40 ± 6.09 |
95.08 |
16.65 ± 0.21 |
1.27 |
-25 ± (1) |
-25 |
-25 to -24 |
2.9 |
2.6 |
| Potable water |
|
|
| Wiggins/Inanda |
Z553D |
0.08-1.01 |
4 |
3.40 ± 3.89 |
114.21 |
3.88 ± 4.32 |
111.45 |
50.20 ± 23.68 |
47.18 |
-11 ± (15) |
-5 |
-29 to 1 |
14.8 |
12.9 |
| DV Harris/Midmar |
Z553D |
1.63-5 |
3 |
1.22 ± 0.55 |
45.19 |
1.82 ± 1.24 |
68.34 |
14.27 ± 2.61 |
18.30 |
-18 (14) |
-11 |
-34 to -10 |
11.7 |
7.8 |
| Hazelmere/Hazelmere |
SF3456 |
2-5 |
3 |
1.21 ± 1.31 |
108.06 |
2.04 ± 1.89 |
92.89 |
11.67 ± 3.74 |
32.10 |
-13± (14) |
-5 |
-29 to -4 |
9.6 |
5.7 |
| Durban Heights/Nagle |
SF3435 |
2.4 |
3 |
3.64 ± 3.83 |
105.36 |
5.01 ± 5.45 |
108.89 |
32.27 ± 22.27 |
69.02 |
-9 ± (6) |
-9 |
-13 to -5 |
8.9 |
6.4 |
|
