Levels of metal ions (mg/l) in pH

Water category	Fe (p=0.000) Mean±SE	Mn p=0.050) Mean±SE	Pb (p=0.050) Mean±SE	Mg (p=0.001) Mean±SE	Ca (p=0.576) Mean±SE	Hg (p=0.239) Mean±SE
Tapwater	0.000±0.000^a	0.000±0.000	0.000±0.000	3.861±3.767^a	128.846±8.640^a	0.001±0.000
Bathroom	0.001±0.001^a	0.003±0.000	0.000±0.000	7.631±0.599^b	95.078±4.022^a	0.001±0.000
Laundry	0.004±0.000^a	0.001±0.001	0.000±0.000	3.577±0.920^a	106.977±5.991^a	0.001±0.000
Kitchen	1.315±0.156^b	0.004±0.000	0.000±0.000	5.419±0.657^b	108.516±6.931^a	0.001±0.000
Matrix	0.003±0.222^a	0.002±0.001	0.000±0.000	2.485±0.758a	90.406±4.382^a	0.001±0.000

NB: Same superscripts mean no significant difference and different superscripts indicate significant difference

Table 2: Levels of metal ions (mg/l) in pH adjusted tap water and treated grey water.

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