Table 6. Comparison between the percentages of viability of (oo)cysts when using microscopy and flow cytometer for chlorine exposures.

	0.5 ppm
DURATION /min	15		30		60		120
Trials	Microscopy	flow cytometer	Microscopy	flow cytometer	Microscopy	flow cytometer	Microscopy	flow cytometer
1	83	85	75	76	51	71	40	67
2	85	82	73	80	58	72	46	67
3	82	77	68	81	45	70	41	63
4	89	83	70	79	57	69	50	69
5	86	81	58	78	54	72	45	66
MEAN±SD	85±3	82±3	69±6	79±1	53±6	71±1	44±4	66±3
2 ppm
1	79	85	63	76	57	71	46	67
2	77	82	70	80	61	72	53	67
3	70	77	61	81	52	70	44	63
4	77	83	70	79	63	69	54	69
5	84	81	62	78	54	72	45	66
MEAN±SD	77±6	82±3	65±5	79±1	57±5	71±1	48±5	66±3
5 ppm
1	42	40	33	31	24	21	14	12
2	32	42	28	32	20	21	16	13
3	42	41	33	33	24	21	11	12
4	39	42	30	35	21	21	14	13
5	50	42	30	33	24	23	17	13
MEAN±SD	41±7	41±1	31±2	33±1	23±2	21±1	15±3	12±0

Note: Trials 1 to 2: Distilled water. Trials 3 to 5: Wastewater. Trials 1 to 3 were performed using Syto-9+PI stains and Trials 4 to 5 were performed using DAPI+PI stains.