Growth on m-Endo	Positive			Negative
Growth on m-Endo	N	Mean	Std. Deviation	N	Mean	Std. Deviation
Free Residual Chlorine (mg/l)	27	0.03	0.07	27	0.14	0.08
Free Residual Chlorine (mg/l)	t = 5.42				p value = 0.000
pH value	27	7.29	0.42	27	7.84	0.45
	t = 4.66			p value = 0.000