The principle
Multi-barrier, not single-point. Sediment, then biology, then storage on a level plinth so water always flows where you want it. Food-grade containers only — never a tank that once held chemicals.
Materials
- Large reclaimed bathtub/trough/cattle tank
- gravel (coarse
- fine)
- sand
- marsh-plant cuttings
- geotextile
- drain hose
Tools
- Spade
- level
- utility knife
- hose cutter
- gloves
Reclaimed from
Demolition sites (tubs) + farms (troughs) + Floresta Comum/nursery + Leroy Merlin