Combines biological treatment with membrane filtration in one packaged unit, producing consistently high-quality reclaimed water suitable for indoor non-potable reuse (toilet flushing) rather than only irrigation/soil discharge, a materially higher performance ceiling than a wetland or sand filter for the same greywater stream. Requires continuous power for aeration/pumping and specialist servicing; membrane fouling is the main failure mode.
Note: Cost, carbon and footprint are rated against the other options for this same need, not in absolute terms.
No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.