Table 2.

Ultrafiltration (UF) recovery efficiencies for study microbes.

Site	n	Average % Recovery Efficiency (SD)
		ΦX174	MS2	Echovirus 1	E. coli	C. perfringens	C. parvum
Chattahoochee river	6 *	58 (16)	91 (38)	69 (9)	98 (11)	86 (15)	78 (33)
Murphy Candler lake	5	74 (14)	65 (33)	50 (15)	85 (38)	55 (10)	70 (24)
Lawrenceville	4 †	100 (23)	85 (23)	130 (24)	ND ‡	73 (21)	120 (37)
Jefferson City	4	110 (31)	77 (8)	45 (27)	87 (16)	69 (10)	120 (44)
Allatoona lake	3 §	81 (17)	53 (19)	53 (32)	79 (12)	100 (9)	100 (11)
Cross-site avg.		81 (26)	76 (29)	66 (33)	88 (23)	75 (20)	95 (37)

Notes:

^*n = 4 for E. coli;

^†n = 3 for echovirus 1;

^‡No data because E. coli were not present at sufficient concentrations for recovery efficiency calculation;

^§n = 2 for C. perfringens.