TABLE 3.

Comparison of percentage of coverage from the DUWS biofilm samples

Sample	% Coverage from biofilm samples taken from:						n
	Water lines			Air lines
	Avg	Minimum	Maximum	Avg	Minimum	Maximum
Water source
Soft	21	0.1	62	0.0	0.1	0.1	10
Hard	48	0.01	94	8.8	0.1	74	27
Deionized	54	0.5	94	1.9	0.1	6.4	8
Distilled	44	5	83	0.1	0.1	0.1	2
Supply type
Tank fed	33	25	50	3.5	0.1	8	3
Bottle fed	41	10	94	2.9	0.1	64	29
Main fed	50	0.1	92	10	0.1	74	15
Total	43	0.01	94	5.2	0.1	74	47