Table 3. Analysis of variance results for adsorbent doses and contact times on the quality parameters of well water

Source	DF	Iron (Fe)	Manganese (Mn)	Color	pH	Turbidity	Total hardness
Adsorbent doses (A)	2	NS	**	NS	**	**	NS
Contact time (C)	2	NS	**	NS	**	NS	NS
A × C	4	NS	**	NS	NS	NS	NS
Error	18
Total	27

NS: non-significant (p > 0.01);
p < 0.01.
DF: degree of freedom.