TABLE 3.

Mean oocyst recoveries and levels of indigenous oocysts in samples of reclaimed water processed by method 1623 and the modified ICR method

Method (filter type)	Protozoan result
	Cryptosporidium			Giardia
		No. of oocysts/100 liters	%a	Adjusted level	No. of cysts/100 liters	%	Adjusted level
Method 1623 (HV) (n = 5)	74	28	264	36	24	150
	20	19	95	34	11	309
	2	1	200	<1	1	NAd
	2	28	7	6	34	18
	107	84	127	34	68	50
		32b			27b
		97c			94c
Envirochek (n = 5)	20	25	80	20	29	69
	90	41	219	90	5	1,800
	<10	16	NA	<10	2	NA
	<10	34	NA	70	47	149
	14	85	16	130	49	265
		40b			26b
		67c			84c
Modified ICR (yarn wound) (n = 5)	1	2	50	2	0	NA
	26	27	96	14	20	70
	2	19	10	<1	13	NA
	<1	12	NA	<1	9	NA
	5	16	31	5	12	42
		15b			11b
		60c			66c

^aPercentage of recovery efficiency based on recoveries obtained with ColorSeed spikes.

^bMean.

^cRSD.

^dNA, not applicable.