Sizing simulator
Move the crew, the base and the perchlorate load. Every number is recomputed from the same sourced constants as the rwl package.
Filter cartridges in parallel
2.1–8.3
Ø75 mm bench columns at slow sand filtration rates. 3 at 0.4 m/h, 9 at 0.1 m/h, rounded up.
Greywater
33.2 L/day
Flow
1.38 L/h
Filter area
0.009–0.037 m²
Trash
8.34 kg/day
Char
0.82 kg/day
Retort heat
5.0–7.6 MJ
57–88 W mean
Head for Earth flow
1.22 m
instead of 0.20 m: why the design adds cartridges
Could Stage 1 feed the crew oxygen?
24 % of crew O₂, even if every molecule were captured (1.29 / 5.37 kg). The bacteria respire it themselves. Covering the crew would take 4.2 t of regolith a day.
One cartridge, by mass
99.8 % made on Mars (1.89 kg) · 4.1 g acetate from Earth. Treated regolith and char from the habitat; the donor until a waste-derived one works. Shell not counted.
Derivations and sources are on Operating on Mars; the same numbers in a terminal with rwl size --explain.