Greywater & Rain Cycles
Treated drinking water is routinely wasted on flushing toilets and watering lawns. A resilient home separates domestic wastewater into distinct fractions: blackwater (toilets and kitchen food sinks) and greywater (showers, hand basins, and washing machine rinse cycles).
Combining biological greywater remediation with direct rainwater harvesting creates a dual-loop supply that reduces external municipal tap dependence by up to 65%.
Vortex Rain Collection
Rooftop precipitation passes through an inline centrifugal stainless-steel vortex filter that separates moss and pine needles, directing clear water into subterranean tanks.
Slow-Sand Aerobic Filtration
Greywater trickles through graded quartz sand and crushed bio-char, where aerobic microbes digest soap residues and surfactant lipids without synthetic additives.
Sub-Surface Irrigation
Remediated effluent is distributed 150mm beneath soil surfaces, preventing human contact while nourishing fruit trees and perennial hedgerows directly at root level.
Plumbing Architecture: The Dual-Header System
To safely integrate circular water streams into a residential structure, plumbing codes demand non-cross-connected pipe lines. Dual-header pipe assemblies utilize distinct green or purple PEX piping for secondary non-potable lines, completely isolated from incoming cold potable mains.
Backflow prevention assemblies (Type AB air gaps) ensure harvested water never siphons into regional utility networks, maintaining total regulatory compliance with EN 1717 / WRAS certifications.
| Water Stream | Typical Source | Filtration Required | Permitted Application |
|---|---|---|---|
| Rainwater (Potable Path) | Roof gutters | Vortex + 5µm cartridge + UV chamber | Showers, Drinking, Cooking |
| Rainwater (Utility Path) | Outbuilding roofs | Coarse mesh (100µm) | Washing machines, Exterior wash |
| Light Greywater | Showers, Baths | Lint trap + Aerobic bio-sand bed | Sub-surface soil irrigation, Toilets |
| Blackwater | Toilets, Food waste | Thermophilic anaerobic digestion | Orchard composting only |