Table 1.

Heterotrophic plate counts and direct microscopic counts of bacteria in therapy pool water, air above the therapy pool, and air immediately outside therapy pool building during sampling events in 2001

Sampling event	Environment	Sampler	Bacterial colony count, m−3	Bacterial microscopy count, m−3	Ratio colony and microscopy count, %
Feb. 15, 2001	Pool air	Impinger	1.7 × 104	8.1 × 106	0.21
	Pool water	Grab		3.8 × 1011
Aug. 16, 2001	Pool air	Impinger	6.1 × 102	7.3 × 105	0.08
	Pool water	Grab		8.5 × 1012
	Outside air	Impinger	9.0 × 101	5.9 × 105	0.02