Build Your Own NFT Hydroponic System: A Complete DIY Guide

What Is NFT?

Nutrient Film Technique: a shallow (1–3"), continuously flowing stream of nutrient solution passes over bare roots in a sloped channel. No media (or just a net pot with clay pebbles for support). Roots get nutrients, water, and oxygen simultaneously.

Why Hobbyists Love It

• Low water/nutrient use (recirculating).
• Easy to inspect roots & harvest.
• Scales from a single 4-ft channel to commercial racks.
• Ideal for lettuce, herbs, strawberries, Asian greens.

Parts List (Single 10-ft Channel)

• 4" PVC square fence post or vinyl gutter (channel)
• End caps + bulkhead fittings (inlet/outlet)
• Submersible pump (200–400 GPH)
• 15–20 gal opaque reservoir
• ½" poly tubing + barbed fittings
• Net pots (2") + clay pebbles
• pH/EC meter, nutrients, timer
• Frame: PVC, lumber, or metal rack (slope 1:30–1:40)

Build Steps

1. Drill 2" holes in channel top (8" centers for lettuce, 12" for larger).
2. Install bulkheads: inlet at high end, outlet at low end.
3. Mount channel on frame with consistent slope.
4. Plumb pump → inlet; outlet → reservoir.
5. Fill reservoir, mix nutrients, adjust pH 5.8–6.2.
6. Place seeded rockwool cubes in net pots with pebbles; set in holes.
7. Run pump 24/7 (or 15 on/15 off with timer).

Critical Maintenance

• Check pump DAILY. Failure = root death in hours (no media buffer).
• Monitor EC/pH every 1–2 days. Top off with water; adjust.
• Full solution change weekly (mature) or biweekly (young).
• Clean channel between crops—algae clogs flow.

Risk Mitigation

• Battery-backup air pump (roots need O₂ even if flow stops).
• Float switch alarm on reservoir low level.
• Spare pump on shelf.

When to Choose Something Else

Fruiting crops (tomatoes, cukes) need more root volume → DWC or drip. Heavy feeders → media-based. But for fast, clean greens? NFT is king.