TABLE 4.

Levels of Cryptosporidium oocysts and Giardia cysts in reclaimed effluents based on results obtained from recovery efficiency experiments with ColorSeed as an internal quality control system

Filtration system at the facility	Protozoan	Level of indigenous (oo)cysts per 100 liters	Recovery efficiency (%)a	Adjusted level of (oo)cysts per 100 liters
Deep bed, multiple media (facilities A and B)	Cryptosporidium	8	31	26
		209	31	674
		36	14	257
		2	8	25
		35	11	318
		40	5	800
Shallow bed automatic backwash (facilities C and D)		28	27	102
		11	10	110
		77	31	248
		75	18	417
		20	19	105
		106	14	757
Deep bed, multiple media (facilities A and B)	Giardia	35	24	146
		13	2	650
		11	10	110
		66	24	275
		20	19	105
		40	42	95
Shallow bed automatic backwash (facilities C and D)		10	31	32
		85	43	198
		118	38	310
		106	14	757
		35	11	318
		75	18	417

^aPercentage of recovery efficiency.