Table 1:

For iron water infrastructure: Surface concentration of surviving Bacillus globigii spores in cfu cm⁻² with decontaminant effectiveness (log reduction) in parenthesis for various decontamination and flushing durations (hr)

Experimental Phase	Time	Disinfectant with its concentration (mg l−1) and water pH
		Free Chlorine			Chlorine Dioxide		Monochlor-amine	Acidified Nitrite		Ozone	PAA
		pH 8, 5 mg l−1	pH 8, 25 mg l−1	pH 7, 25 mg l−1	5 mg l−1	25 mg l−1	25 mg l−1	pH 2, 0.1 mol l−1	pH 3, 0.1 mol l−1	2 mg l−1	25 mg l−1
Spore Injection	0 min (initial)	2.2×105 (0.0)	2.5×105 (0.0)	1.7×105 (0.0)	2.2×105 (0.0)	2.0×105 (0.0)	1.9×105 (0.0)	2.2×105 (0.0)	7.1×105 (0.0)	2.0×105 (0.0)	1.5×105 (0.0)
Decontamin-ation with Disinfectant	1 hr	1.8×105 (0.1)	4.2×104 (0.8)	1.5×104 (1.1)	6.3×104 (0.5)	2.5×103 (1.9)	2.0×105 (0.0)	7.0×103 (1.5)	9.7×104 (0.9)	2.5×104 (0.9)	8.6×104 (0.2)
	2 hr	1.5×105 (0.2)	3.8×104 (0.8)	1.5×104 (1.1)	5.6×104 (0.6)	1.5×104 (1.1)	2.0×105 (0.0)	4.9×103 (1.6)	1.5×105 (0.7)	1.5×104 (1.1)	7.0×104 (0.3)
	3 hr	1.3×105 (0.2)	4.2×104 (0.8)	1.7×104 (1.0)	4.9×104 (0.7)	2.8×103 (1.9)	1.0×105 (0.3)	4.0×103 (1.7)	9.9×104 (0.9)	2.0×104 (1.0)	8.5×104 (0.2)
	4 hr	2.3×105 (0.0)	4.1×104 (0.8)	2.0×104 (0.9)	3.5×104 (0.8)	4.5×103 (1.6)	1.1×105 (0.2)	2.4×103 (2.0)	1.8×105 (0.6)	1.9×104 (1.0)	4.7×104 (0.5)
	6 hr	1.4×105 (0.2)	2.8×104 (1.0)	1.7×104 (1.0)	2.7×104 (0.9)	0.0 (>3.6)	9.8×104 (0.3)	5.2×103 (1.6)	1.1×105 (0.8)	1.2×104 (1.2)	4.5×104 (0.5)
	18 hr	1.6×105 (0.1)	2.5×104 (1.0)	1.8×104 (1.0)	2.5×104 (0.9)	0.0 (>3.6)	2.5×104 (0.9)	5.0×102 (2.6)	2.7×104 (1.4)	1.4×104 (1.2)*	2.3×104 (0.8)
	22 hr	1.3×105 (0.2)	1.6×104 (1.2)	1.2×104 (1.2)	2.7×104 (0.9)	0.0 (>3.6)	1.7×104 (1.0)	1.0×103 (2.3)	1.5×105 (0.7)	No Data	1.9×104 (0.9)
Flushing 0.3 m sec−1 (1 ft sec−1)	24 hr	9.8×104 (0.3)	1.4×104 (1.3)	9.8×103 (1.2)	2.0×104 (1.0)	2.5×102 (2.9)	1.9×104 (1.0)	0.0 (>3.6)	1.6×104 (1.6)	4.5×103 (1.6)	1.6×104 (0.9)
	26 hr	7.3×104 (0.5)	1.2×104 (1.3)	1.3×104 (1.1)	1.6×104 (1.1)	2.5×102 (2.9)	1.7×104 (1.1)	2.5×102 (2.9)	1.9×104 (1.6)	1.8×103 (2.1)	2.1×104 (0.8)
	44 hr	8.1×104 (0.4)	7.3×103 (1.5)	7.3×103 (1.4)	1.5×104 (1.2)	5.0×102 (2.6)	1.3×104 (1.2)	0.0 (>3.6)	6.6×103 (2.0)	2.0×103 (2.0)	1.6×104 (1.0)

^*Data is from 12 hours after the start of ozone treatment