Table 3

The physicochemical parameters of water flowing from storage tanks of different material types

ParameterMean
SIG. (α = 0.05)
Tank materialSS (n = 24)PE (n = 58)GS (n = 30)
Free chlorine (mg/L) 0.004 ± 0.001 0.006 ± 0.001 0.042 ± 0.040 0.952 
Colour (Pt Co) 6.250 ± 0.620 9.020 ± 0.920 17.430 ± 3.500 *0.018 
SO42− (mg/L) 6.650 ± 0.160 5.890 ± 0.300 6.000 ± 0.370 0.549 
Mn (mg/L) 0.011 ± 0.001 0.013 ± 0.001 0.018 ± 0.001 0.089 
Fe (mg/L) 0.027 ± 0.001 0.055 ± 0.020 0.207 ± 0.080 0.242 
ParameterMean
SIG. (α = 0.05)
Tank materialSS (n = 24)PE (n = 58)GS (n = 30)
Free chlorine (mg/L) 0.004 ± 0.001 0.006 ± 0.001 0.042 ± 0.040 0.952 
Colour (Pt Co) 6.250 ± 0.620 9.020 ± 0.920 17.430 ± 3.500 *0.018 
SO42− (mg/L) 6.650 ± 0.160 5.890 ± 0.300 6.000 ± 0.370 0.549 
Mn (mg/L) 0.011 ± 0.001 0.013 ± 0.001 0.018 ± 0.001 0.089 
Fe (mg/L) 0.027 ± 0.001 0.055 ± 0.020 0.207 ± 0.080 0.242 

SS = stainless steel tanks; PE = plastic tanks; GS = galvanised steel tanks; *, significance (α = 0.05).

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