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Design of the experiment.
| Group | n | Factor (disinfection method) |
|---|---|---|
| NC | 120 | Not disinfected |
| PC | 120 | Disinfected by fumigation with formalin and permanganate |
| H2O2 | 120 | Disinfected with 30% hydrogen peroxide by spraying |
| O3 | 120 | Disinfected by ozone (O3, 4.2 mg O3/h, 5 min) |
