A no-endorsement guide to common home setups. No affiliate links. No sponsored content. Just an honest comparison.
The hydroponic market ranges from elegant and effective to expensive and overcomplicated. Most beginners don't need a sophisticated system. Understanding what the main types actually do helps you choose something appropriate rather than being sold something unnecessary. Systems below are listed roughly in order of complexity, from simplest to most involved.
Kratky (Passive)
Best for beginners
A static reservoir with no pump, no electricity, no moving parts. Plant roots grow down into the nutrient solution while an air gap provides oxygen. As the plant drinks, the reservoir drops and the air gap grows — the plant self-manages its own oxygen-to-water ratio.
Good for
Lettuce, herbs, spinach. Any leafy green. Single plants or small collections.
Not ideal for
Large fruiting plants — tomatoes, cucumbers — which need more root oxygenation than passive systems provide.
Approximate cost
$5–30 per unit. A mason jar setup costs almost nothing.
Space needed
Whatever the container size. Fits on a windowsill.
The right starting point for almost everyone. Build a mason jar kratky before spending money on anything else.
DWC (Deep Water Culture)
Popular for home growing
Like Kratky, but with an air pump continuously oxygenating the nutrient solution. Roots are fully submerged, requiring active aeration to prevent rot. Allows larger reservoirs and bigger plants.
Good for
Tomatoes, peppers, cucumbers, large leafy plants. A capable all-round system.
Not ideal for
Root vegetables. If the pump fails, plants can deteriorate quickly.
Approximate cost
$30–150 for a DIY or basic commercial setup.
Space needed
A 5-gallon bucket supports one large tomato. Scales up easily.
The most common home system for fruiting crops. Well-documented, easy to DIY.
NFT (Nutrient Film Technique)
Intermediate
A thin film of nutrient solution flows continuously through angled channels. Plant roots hang in the channels, with the bottom touching the flowing film and the top exposed to air. High oxygen availability makes this efficient for production growing.
Good for
Lettuce and leafy greens at scale. The system used by most commercial hydroponic lettuce producers.
Not ideal for
Large fruiting plants. Pump failure means total crop loss quickly.
Approximate cost
$100–500+ depending on scale. DIY builds common with PVC pipe.
Space needed
Channels stack vertically — efficient per square foot.
Worth considering for significant quantities of leafy greens. Overkill for casual growing.
Ebb and Flow (Flood and Drain)
Intermediate
A grow tray is periodically flooded with nutrient solution, then drained back to a reservoir. The cycle — typically 2-4 times per day — delivers nutrients while ensuring roots get oxygen between floods. Flexible: supports almost any growing medium and a wide variety of plants.
Good for
Almost anything. Good for growers who want one system for multiple plant types.
Not ideal for
Beginners — more components, more things that can go wrong. Timer reliability is critical.
Approximate cost
$100–400 for a basic setup.
Space needed
A 2x4 ft tray is a common starting size.
A capable all-rounder. More setup complexity than DWC for not always more benefit at home scale.
Drip Systems
Scalable
Nutrient solution is dripped onto the base of each plant from above. Can be recirculating (excess drains back to reservoir) or run-to-waste. The most common system in large-scale commercial horticulture.
Good for
Tomatoes, peppers, cucumbers at scale. Rooftop farms and greenhouse operations.
Not ideal for
Small-scale home growing — the system overhead doesn't pay off for a few plants.
Approximate cost
$50–200 for a basic DIY setup. Scales efficiently.
Space needed
Scales to any size. Best for dedicated growing spaces.
The right choice for a serious rooftop or greenhouse setup. Overkill for a few pots.
What to Actually Buy First
If you haven't grown hydroponically before: spend less than $20 on a kratky lettuce setup. Mason jar, a 2-inch net cup, hydroton clay pebbles, a bottle of nutrients, a cheap pH meter, a seedling. Grow it to harvest. If you enjoy it and want more, you'll know exactly what to scale up to based on real experience rather than speculation.
The most expensive mistake in hydroponics is buying a sophisticated system before you understand the basics. The basics are cheap to learn.