Table 2

Physicochemical parameters of water flowing to and from the storage tanks

ParameterMean
SIG. (α = 0.05)
Tank inflowTank outflow
Free chlorine (mg/L) 0.24 ± 0.02 0.05 ± 0.01 *<0.001 
Turbidity (NTU) 0.75 ± 0.06 0.87 ± 0.06 0.178 
Temperature (°C) 24.00 ± 0.14 24.15 ± 0.24 0.647 
DO (mg/L) 7.60 ± 0.05 7.47 ± 0.07 0.142 
Colour (Pt Co) 6.97 ± 0.71 10.68 ± 1.11 *0.008 
EC (μS/cm) 99.08 ± 0.78 102.76 ± 2.34 0.299 
TDS (mg/L) 63.44 ± 0.50 65.77 ± 1.50 0.332 
pH 7.47 ± 0.04 7.49 ± 0.04 0.484 
SO42− (mg/L) 7.20 ± 0.20 6.07 ± 0.19 *<0.001 
PO43− (mg/L) 0.04 + 0.01 0.05 ± 0.01 0.351 
NO3− (mg/L) 0.00 0.01 ± 0.01 0.665 
Mn (mg/L) 0.008 + 0.01 0.013 + 0.001 *0.023 
Fe (mg/L) 0.04 ± 0.01 0.09 ± 0.02 *0.001 
Pb (mg/L) <0.07 <0.07 N/A 
Zn (mg/L) <0.04 <0.04 N/A 
ParameterMean
SIG. (α = 0.05)
Tank inflowTank outflow
Free chlorine (mg/L) 0.24 ± 0.02 0.05 ± 0.01 *<0.001 
Turbidity (NTU) 0.75 ± 0.06 0.87 ± 0.06 0.178 
Temperature (°C) 24.00 ± 0.14 24.15 ± 0.24 0.647 
DO (mg/L) 7.60 ± 0.05 7.47 ± 0.07 0.142 
Colour (Pt Co) 6.97 ± 0.71 10.68 ± 1.11 *0.008 
EC (μS/cm) 99.08 ± 0.78 102.76 ± 2.34 0.299 
TDS (mg/L) 63.44 ± 0.50 65.77 ± 1.50 0.332 
pH 7.47 ± 0.04 7.49 ± 0.04 0.484 
SO42− (mg/L) 7.20 ± 0.20 6.07 ± 0.19 *<0.001 
PO43− (mg/L) 0.04 + 0.01 0.05 ± 0.01 0.351 
NO3− (mg/L) 0.00 0.01 ± 0.01 0.665 
Mn (mg/L) 0.008 + 0.01 0.013 + 0.001 *0.023 
Fe (mg/L) 0.04 ± 0.01 0.09 ± 0.02 *0.001 
Pb (mg/L) <0.07 <0.07 N/A 
Zn (mg/L) <0.04 <0.04 N/A 

*Significant difference; N/A = Not applicable.

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