Which hydroponic system should you build?
Answer five questions and see all six system types ranked for your budget, your space and what you actually want to grow.
Compare all six side by side
| System | Cost | Power | Difficulty | Min. space | If the power cuts | Best for |
|---|---|---|---|---|---|---|
| Kratky method | $5 to $15 | None | Very easy | Windowsill | Nothing happens | greens, herbs |
| Deep water culture | $25 to $60 | Air pump | Easy | Shelf | Survives hours | greens, herbs, mixed |
| Nutrient film technique | $50 to $200 | Water pump | Moderate | Corner | Trouble within hours | greens, herbs, strawberries |
| Ebb and flow | $75 to $300 | Pump + timer | Moderate | Corner | Survives hours | fruiting, mixed |
| Drip system | $50 to $250 | Pump + timer | Moderate | Corner | Survives hours | fruiting, strawberries, mixed |
| Aeroponics | $150 to $500 | Pump + timer | Hard | Dedicated area | Trouble within hours | greens, herbs |
Scores weigh your answers against the six system types. They are a starting point for a decision, not a verdict: a keen beginner can absolutely build an NFT system, and an experienced grower may still want a jar on the windowsill. Every figure here matches our individual system guides.
Most people choosing their first hydroponic system are really asking two questions at once: which one will grow what I want, and which one will I actually manage to keep alive? Those pull in different directions, and the honest answer usually depends less on the crop than on how often you are away from home.
The one question that decides most of it
Every system on this site is a different answer to the same problem: how do you keep roots wet and breathing at the same time? The engineering that solves it is also the thing that can fail.
| System | How it oxygenates roots | What happens if it fails |
|---|---|---|
| Kratky | The water level falls as the plant drinks, leaving an air gap | Nothing can fail. There are no moving parts. |
| Deep water culture | An air stone bubbles continuously | Solution goes still and warm. Root rot within a day or two. |
| Nutrient film technique | A thin film flows past roots sitting mostly in humid air | Roots dry out within hours. The least forgiving of the common designs. |
| Ebb and flow | The tray drains, pulling fresh air through the medium | The medium stays damp for a while, so you usually have a day. |
| Drip | Solution drips through an airy medium | As above, though a clogged emitter starves one plant silently. |
| Aeroponics | Bare roots are misted at intervals | Bare roots die within the hour. |
What the ranking is actually weighing
The tool is not a black box, and the weights are deliberately simple:
| Factor | Weight | Why that much |
|---|---|---|
| Budget fit | 25% | A system you cannot afford to finish is not a system. |
| Experience vs difficulty | 25% | The most common reason a first build fails is that it was too ambitious. |
| Crop suitability | 25% | Some pairings genuinely do not work. Tomato roots will dam an NFT channel. |
| Time away | 15% | The failure mode that actually kills plants. |
| Space | 10% | Real, but usually the easiest constraint to work around. |
Ties break in favour of the cheaper system, because on this site the cheaper option nearly always is the right first answer.
The honest shortcut
If reading all that feels like work, here is the version we would give a friend:
Never grown anything hydroponically? Build the Kratky jar.
About $10 and fifteen minutes. It is not a lesser system, it is the one that teaches you what healthy roots look like without any risk. The free plan is here.
Harvested once and want more? Build the bucket DWC.
Four plants, about $30, and it introduces you to pumps and oxygenation. The free plan is here.
Want a lot of greens in a small footprint? Build the PVC NFT.
Six to eight plants for around $50, but only once you know what root rot looks like. The free plan is here.
Want tomatoes or peppers? Go drip or ebb and flow.
Both handle big, hungry, heavy plants that water-culture systems struggle with.
What the tool does not know
- Your water. Very hard or very soft water changes how much attention pH needs, whatever system you pick. Our pH guide covers it.
- Your electricity cost. An air pump running around the clock is a few dollars a year, but a big light is not. The running cost calculator works that out.
- Whether you enjoy building things. Some people want the tinkering and some want a jar on a sill. Both are completely valid, and no scoring model can tell which you are.
- What you already own. A spare aquarium pump in a drawer moves DWC up the list on its own.
Frequently asked questions
What is the easiest hydroponic system for beginners?
The Kratky method. It is a sealed container, a net pot and nutrient solution, with no pump, no timer and no electricity, so there is nothing that can fail while you are out. A jar costs about $10 and takes fifteen minutes to set up.
Which hydroponic system is best for tomatoes and peppers?
Drip or ebb and flow. Both handle large, heavy, hungry plants that need support and a lot of feeding. A single plant in its own deep water culture bucket also works well. Avoid nutrient film technique, because a mature tomato root mass will block the channel.
What is the cheapest hydroponic system to build?
A Kratky container at $5 to $15, and a soda bottle version is cheaper still. Deep water culture is next at roughly $25 to $60, most of which is the air pump and the growing medium.
Which hydroponic system is best if I travel a lot?
A passive Kratky system, because it has no pump to fail and no power to cut. If you need more capacity, deep water culture survives a short outage far better than nutrient film technique or aeroponics, where bare or barely-covered roots dry out within hours.
Do I need a pump for hydroponics?
No. The Kratky method works entirely without one, and it is what we recommend for a first build. Every other system here uses a pump either to move water or to add oxygen, which is what buys the faster growth.
Which system grows plants fastest?
Aeroponics, because bare roots have unlimited access to oxygen. It is also the least forgiving system here, and the difference over a well-run deep water culture bucket is not worth the risk for a beginner.
Can I mix different crops in one system?
Ebb and flow handles it best, because plants sit in individual pots rather than sharing open water, so you can run different sizes side by side. In deep water culture, keep plants with similar water and feeding needs together.
Decided? Every plan is free
The three build plans on this site cover Kratky, deep water culture and NFT, and all of them cost under $50.