Elapsed

Time

Water

Quality Items

0 hr

1 hr

2 hrs

Drinking

Water Quality

Standards

① TOC (mg/L)

2.4

3.3

3.8

≤3 mg/L

② Ca²⁺ (μg/L)

400

450

440

≤300 mg/L

③ Mg²⁺ (μg/L)

30

70

90

≤300 mg/L

④ ${\text{NO}}_3^{-}$ & ${\text{NO}}_2^{-}$ (mg/L)

0.3

0.3

0.3

≤10 mg/L

⑤ ${\text{NO}}_2^{-}$ (mg/L)

0.05

0.06

0.06

≤0.04 mg/L

⑥ No. of General Bacteria (CFU/mL)

13

9

8

≤100 CFU/mL

⑦ No. of Colitis Germ Legions

Detected

ND

ND

ND*

⑧ pH

6.0

6.4

7.0

5.8 - 8.6