Design Channel Slope and Length
Half dayPlan 1–2% channel slope, calculate flow rate GPM for film depth, and size nutrient stock tank for weekly dilution.
Field context
This workflow is part of 2 niche fields
Complete guide for nft system build — step-by-step workflow, tools, checklist, and expert tips to get started.
Plan 1–2% channel slope, calculate flow rate GPM for film depth, and size nutrient stock tank for weekly dilution.
Match pump GPM to channel count, size catch reservoir for 5-minute pump-off hold, dilute stock concentrate to working EC.
Install channels on slope, verify even film across all channels at calculated GPM, adjust end caps and slope shims.
Transplant to channel baskets when roots emerge, log EC and pH twice daily first week, adjust stock dilution as uptake stabilizes.
Calculates pump GPM and channel slope for proper nutrient film depth.
Dilutes concentrate stock to working solution EC for NFT reservoir.
Tracks EC targets through vegetative and flowering crop stages.
Determines when to refresh NFT reservoir based on volume and plant load.
NFT Flow Guidelines
| Channel Width | Target GPM | Slope |
|---|---|---|
| 2 in | 0.5–1.0 | 1:100 |
| 4 in | 1.0–2.0 | 1:100 |
| 6 in | 2.0–4.0 | 1:100 |
Adjust pH before adding nutrients — pH drift after mixing wastes expensive inputs.
Keep reservoir 65–70°F — warmer water holds less oxygen and invites root rot.
Drip loops on all cords entering reservoirs and GFCI on every outlet.