Table A5 Typical daily volumes of blackwater per person for different types of toilet
| Type of toilet | Total volume per EDU (L/day) |
|---|---|
| Conventional toilet (older style with 15 L per flush) | 284 |
| Dual-flush toilet (11/5.5 L) | 122 |
| Dual-flush toilet (6/3 L) | 70 |
| Dual-flush toilet (3.3/1.5 L) | 38 |
| Vacuum toilet (non-separating)* | 28 |
| Vacuum toilet (separating)* | 7.5 |
| Hybrid toilet | < 6 |
* It is possible to obtain (although not yet available in NZ) vacuum toilets for residential installation, and some are designed to separate the urine and faeces. Typically the flush volumes used for the faeces flush is about 1.0 to 0.5 L per flush and for the urine 0.1 L per flush. Therefore the total flushed volume for the separating toilets can be very low.
