DOC №091SEC: GUIDESREV: 2026-05-16AUTHORED
DWC vs Kratky — Active vs Passive Hydroponics
DWC pumps oxygen continuously; Kratky lets the water level drop and exposes aerial roots. Cost, yield, failure modes, and crop fit compared.
BY ROOTLESS FARM
Side by side
| Factor | DWC | Kratky |
|---|---|---|
| Pump | required | none |
| Power | 25 W | 0 W |
| Cost (per plant) | $5–8 | $2–4 |
| Cycle reuse | yes (top-up nutrient) | no (one-shot reservoir) |
| Best crop | lettuce, basil, kale, tomato | lettuce, herbs |
| Failure speed | hours | days |
Choose DWC if…
…you grow continuously, have reliable electricity, and want larger crops.
Choose Kratky if…
…you grow occasionally, want zero electricity, or teach beginners.
FAQ
2 entries- Q01Is Kratky as productive as DWC?
- For lettuce and herbs in a single cycle, yes. For continuous succession or heavy feeders (tomato, pepper), DWC pulls ahead.
- Q02Which fails harder?
- DWC fails fast when the pump dies (24h to root rot). Kratky fails slow — the reservoir runs dry first.