Table 1. Water Qualities of Different Water Samples^a.

water quality	tap water	SW1	SW2	SW3
total nitrogen (mg/L)	2.6 ± 0.2	2.1 ± 0.2	2.3 ± 0.1	5.2 ± 0.2
total phosphorus (mg/L)	ND	0.05 ± 0.01	ND	0.12 ± 0.02
NH3–N (mg/L)	ND	0.24 ± 0.05	0.44 ± 0.08	2.58 ± 0.15
pH	8.0 ± 0.1	8.2 ± 0.1	8.2 ± 0.2	7.8 ± 0.1
suspended solids (mg/L)	ND	18 ± 2	18 ± 2	19 ± 1
COD (mg/L)	ND	11 ± 1	11 ± 1	11 ± 2
TOC (mg/L)	2.4 ± 0.2	4.2 ± 0.2	4.3 ± 0.2	3.9 ± 0.3

^aNote: ND indicates below the detection limit.