Table 3.

Fecal indicator bacteria and physical-chemical parameters of water samples collected from swimming pools in Beijing, China

Pool type	Statistics	HPCa (CFU/ml)	TCb (MPN/L)	Urea (mg/L)	Turbidity (NTU)	pH	Free chlorine (mg/L)
Outdoor pool	Mean±SD	232.0±228.0	3.0±4.1	3.7±3.3	0.3±0.1	7.3±0.2	0.4±0.1
	Median	140.0	3.5	3.7	0.3	7.4	0.4
	Range	50–600	<3–8	0.3–7.5	0.2–0.4	7.1–7.5	0.3–0.5
School pool	Mean±SD	90.8±199.7	2.5±3.8	2.0±1.6	0.3±0.1	7.2±0.2	0.5±0.1
	Median	8.6	1.9	1.1	0.3	7.2	0.5
	Range	<1–700	<3–12	0.4–4.3	0.2–0.6	7.0–7.4	0.3–0.8
Community pool	Mean±SD	13.3±40.0	0.3±1.0	2.6±2.4	0.4±0.2	7.2±0.1	0.8±0.3
	Median	13.3	0.3	1.6	0.5	7.1	0.6
	Range	<1–120	<3–3	0.2–6.5	0.1–0.8	7.1–7.4	0.5–1.5
Hotel pool	Mean±SD	197.7±356.1	4.6±7.5	1.7±1.6	0.3±0.2	7.2±0.2	0.4±0.2
	Median	30.0	3.0	1.4	0.3	7.2	0.4
	Range	<1–1,100	<3–27	0.1–4.3	0.1–0.6	7.0–7.6	<0.02–0.6
Bath pool	Mean±SD	63.3±119.9	0.9±1.7	2.3±1.8	0.3±0.2	7.2±0.1	0.7±0.4
	Median	35.6	0.9	2.8	0.3	7.1	0.6
	Range	<1–400	<3–4	0.3–5.7	0.1–0.7	7.0–7.4	0.3–1.3
Commercial pool	Mean±SD	297.8±517.3	5.0±9.8	2.4±2.1	0.4±0.2	7.2±0.2	0.4±0.2
	Median	80.0	2.0	0.9	0.4	7.2	0.5
	Range	<1–1500	<3–30	0.4–5.8	0.1–0.7	7.0–7.6	<0.02–0.7
All types	Mean±SD	139.7±292.1	2.7±5.7	2.3±2.0	0.3±0.2	7.2±0.2	0.6±0.3
	Median	9.4	1.5	1.5	0.3	7.2	0.5
	Range	<1–1,500	<3–30	0.1–7.5	0.1–0.8	7.0–7.6	<0.02–1.5

^aHPC, heterotrophic plate count.

^bTC, total coliform.