Table 2.
Cumulative Bowl Water Clearance by Flush Number (Logs*)
| Toilet Type and Suspension | 4 Flushes | 12 Flushes | 24 Flushes | |||
|---|---|---|---|---|---|---|
| LO | HI | LO | HI | LO | HI | |
| PAT 0.25 μm FM | 5.0 | 5.0 | 5.1 | 5.0 | – | – |
| FOM 0.25 μm FM | – | 5.4 | – | 5.7 | – | 6.0 |
| HET 0.25 μm FM | 5.9 | 5.0 | 7.0 | -- | 7.4 | – |
| HET 0.5 μm FM | 5.3 | – | 7.2 | – | 7.3 | – |
| HET 1.0 μm FM | 6.2 | – | 7.5 | – | 7.8 | – |
| HET PF | 4.5 | 5.4 | 5.2 | 5.8 | 5.5 | 6.0 |
| FOM PF | 5.1 | 5.6 | 5.6 | |||
| FOM CD | 8.0 | 8.9 | ND | |||
*
Calculated as log10 (1/fraction remaining after n flushes).
PAT = pressure-assisted toilet; FM = fluorescent polymer microspheres; FOM = flushometer toilet; HET = high efficiency gravity flow toilet; PF = Pseudomonas fluorescens; CD = Clostridium difficile; LO = lower flush volume; HI = higher flush volume; ND = none detected.