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
- 2-4 large reclaimed barrels (200L)
- first-flush ball valve
- hose/piping
- overflow to swale
Tools
- Spade
- level
- drill
- spanner
- hose cutter
Reclaimed from
Stockyards + food-industry recyclers + OLX barril + farm suppliers