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N.F.T. Downspout Hydroponics Setup

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N.F.T. (Nutrient Film Technique) Downspout Hydroponics

We have been growing food in the N.F.T. Downspout hydroponics now for a few years. It is our preferred choice for indoor gardening. In this post, we are showing you how to set up a simple NFT downspout Hydroponics system.

There are different types of hydroponic systems: Water Culture, Ebb and Flow (Flood & Drain), Drip (recovery or non-recovery), N.F.T. (Nutrient Film Technique), and Aeroponic.

We have been experimenting with aeroponic Tower Garden, Kratky hydroponics, High pressure aeroponic, and N.F.T. For indoor growing N.F.T. is our favorite setup.

Why Choose Hydroponics?

Hydroponics allows us to grow food year-round despite our cold climate. It’s a very clean method to grow and very well suitable for indoor growing.

By definition, Hydroponics is a method of growing plants in a nutrient-rich water solution. Instead of using soil, the root system is supported by an inert medium such as vermiculite, Rockwool, peat moss, or clay pellets.

Hydroponics gives you the ability to precisely control the variables that affect how well your plants grow. A fine-tuned hydroponic system lets the plants mature up to 25% faster and give up to 30% more yield by consuming less water when compared to growing in soil.

N.F.T. (Nutrient Film Technique) Downspout Hydroponics

What is N.F.T. Downspout Hydroponics?

N.F.T. (Nutrient Film Technique) Downspout Hydroponics

Nutrient Film Technique (N.F.T.) Downspout Hydroponics is an exceptionally simple hydroponics setup. Nutrient enriched water is pumped into a vinyl downspout, drifts over the exposed roots, and is drained back into the reservoir. Normally in the N.F.T. system, the nutrient solution is being pumped continuously, but we are experimenting with 15 minutes cycles during the day, and 30 minutes at night. Pumping in intervals helps to get more oxygen to the roots between the pumping cycles. However, it’s also important to dissolve as much oxygen in the solution as possible via an air pump and airstone (a.k.a. aquarium bubbler).

The downspout pipe can be as long or short as you want it to be. It also can be set up at different levels, as long as water flows through it, it will work.

Every time water flows through the system, the roots of the plant are watered and nourished.

Planting for downspout hydroponic is just the same as any hydroponics, read more on planting a hydroponic garden here.

Materials needed for the setup

  • White Vinyl downspout
  • Amerimax White Vinyl A-Elbow
  • Amerimax downspout flex elbow
  • Submersible fountain/pond pump (200-300 gph)
  • 1/2 Barbed elbow fitting
  • Roll 1/2″ tubing
  • U-hook (4-pack)
  • Electric drill with a 2” hole saw
  • 2” round net pots (pot should have a rim that makes it slightly larger than 2”)
  • A large clean plastic tub with lid (25-30 gal size works well)
  • Zip ties

How to set up an N.F.T. downspout Hydroponics system

indoor garden

Note that we built our system according to our room situation. We have a 22 feet wide area that is all windows, so we installed the downspout along with the south-facing windows. It allows us to manage without any additional lighting. It can easily be adjusted to any window or growing situation without grow lights. Read more about the garage grow room here.

N.F.T. (Nutrient Film Technique) Downspout Hydroponics

Drill 2” holes every 6” in the top/wide side of the downspouts. TIP: Before drilling ALL the holes insert the 2” net pot in the first hole to make sure it sits well and doesn’t fall through.

N.F.T. (Nutrient Film Technique) Downspout Hydroponics

When installing the U-hooks to support the downspout you need a slight decline (0.5in over 10ft) toward the exit end of the system, so the water can flow smoothly but not too fast. The other reason for the very small slope is shown in the next picture.

There you see a green plastic plate inside the downspout with a rectangle hole in the center. The purpose of it is to hold back the water and raise its level so it would soak the Rockwool cube in the net pot, as the net pots are not long enough to reach the bottom of the downspout. This is important for young seedlings when the roots are not long enough to reach the bottom of the downspout pipe.

The two notches at the bottom of the green plastic barrier allow the draining of the water between the pump run cycles. That allows exposing the plant’s roots to the oxygen in the air which contributes to faster growth.

N.F.T. (Nutrient Film Technique) Downspout Hydroponics

We have set up the 20′ long N.F.T. downspout system alongside the windows of the winter garden using the U-hooks. However, you can adjust the length of the downspouts to the total width of your windows or available space.

N.F.T. (Nutrient Film Technique) Downspout Hydroponics

Fasten the downspout to the support U-hooks using zip ties. Drill a small hole on the top side on the higher end of the downspout for the barbed elbow fitting. Connect it with the tube to the pump in the reservoir. You can plug off that end with an Amerimax white vinyl A-elbow pointing up. The other possibility is heating up with a heat gun about 2″ of the underside of the downspout and pushing it up to close the opening of the pipe as shown in the left picture below. The right picture demonstrates the closing of the pipe with an A-elbow. In addition, it is important then to seal all pipe connections with a food-grade silicone to prevent any leakage.

N.F.T. (Nutrient Film Technique) Downspout Hydroponics

Install an Amerimax downspout A-elbow on the other end of the downspout and connect it with the flex elbow to the tank for drainage.

N.F.T. (Nutrient Film Technique) Downspout Hydroponics

It is an inexpensive setup for home growers allowing us to grow our own lettuce year-round, here are 3 reasons to grow your own salad greens.

NFT downspout Hydroponics system upgrade

See also an upgrade in this N.F.T. system with bigger pipes for larger plants here.

Maintenance of the N.F.T. downspout Hydroponics system

The N.F.T. downspout Hydroponics system really shines when it comes to maintenance. All the nutrients solution is in one container that is easily accessible, cleaned, and refilled.

Read more about the planting, what nutrition to use, and more in the blog post Planting a hydroponic garden.

We usually just top up the solution every week as needed. About twice a year, or as needed we empty the container completely and clean the pump.

Once a year the whole system gets a deep clean. We do that in the middle of summer when the indoor garden gets a fresh start for the winter season. For us, it works best when we disassemble the pipe system, scrub the in- and outside thoroughly, and rinse it off. Then the shiny pipes go back to their place in the system and the next season can begin.

Planting a Hydroponic Garden

Replanting is also simple. Remove the old plant, with all the roots as much as possible, and put a clean net pot with a new seedling in. Net pots can be cleaned and reused. Again, read more about all this in the blog post Planting a hydroponic garden.

We invite you to subscribe to Northern Homestead and follow us on Instagram, Facebook, or Pinterest for the latest updates.

More post you might enjoy:

Starting Seeds Indoors

Starting Seeds Indoors

Trouble-shooting in an Indoor Edible Window Garden

Troubleshooting in an Indoor Edible Garden

Start growing food the the Kratky hydroponics way today! It is a simple and fun container gardening method suited for off-the-grid and water saving growing.

Growing Food the Kratky Hydroponics Way

Temperature and humidity for an indoor edible window garden is important. You want to adjust what you grow to how warm or cool your room is.

Temperature for an indoor edible garden

Additional light for an indoor edible window garden

Additional light for an indoor edible window garden

What to Grow in an Indoor Edible Window Garden. Over the years we have grown a whole lot of plants indoors at a window: Microgreens, herbs, Aloe Vera, strawberries, lettuce, winter greens like kale, root vegetables like carrots, winter vegetables like broccoli, summer vegetables like tomatoes and even water melons.

What to Grow in an Indoor Edible Garden

N.F.T. (Nutrient Film Technique) Downspout Hydroponics

N.F.T. Downspout Hydroponics Setup

Growing an indoor edible garden in soil

Growing an indoor edible garden in soil

Planting a Hydroponic Garden

Planting a Hydroponic Garden

Preventing birds from flying into windows

Preventing birds from flying into windows

Fresh and dry basil in the winter

Growing and Preserving Basil

Growing Lemon in cold climate

Lemon tree in the indoor garden on Video

Why we heat the indoor garden with electricity

Why we heat the indoor garden with electricity

Indoor garden update fall/winter 2019. See our newly renovated indoor garden at the back of our old garage. It's a four-season growing room.

Indoor Garden Update Fall/Winter 2019

NFT downspout Hydroponics system upgrade

NFT downspout Hydroponics system upgrade

High Pressure Aeroponics

High Pressure Aeroponics Guide

Growing Microgreens and Baby Salad Greens

Growing Microgreens and Baby Salad Greens

Garden Update - Winter 2019 on video

GARDEN UPDATE – Winter 2019 ON VIDEO

An Alternative to a Passive Solar Greenhouse - Indoor Window Garden

An Alternative to a Passive Solar Greenhouse – Indoor Window Garden

Controlling aphids with No-Pest strips

Controlling aphids with No-Pest strips

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Filed Under: Building, Gardening, Hydroponic Gardening, Indoor Garden Tagged With: Hydroponic, Indore Garden

Reader Interactions

Comments

  1. Sheri says

    at

    That N.F.T. downspout hydroponics setup is cool!

    Reply
    • Anna says

      at

      Thank you, we like it a lot. a simple and inexpensive way to grow lots of lettuce even in the winter.

      Reply
  2. WT Abernathy says

    at

    Definitely something to consider- we’re not as cold as you, but in 5a our seasons are also drastically short. What is your ambient temp for the grow room on average?

    Reply
    • Anna says

      at

      We try to stay above 13C (55F) in the room and have a heater in the water. On sunny days it gets much warmer than this but on cold overcast days, we hardly go above 15C. Lettuce seems to be fine with it.

      Reply
      • Martine Veldman says

        at

        Good to know, as I am living close by (20 km West of Red Deer) and seem to have about the same weather as you have. Love the idea that it looks clean and organized too.

        Reply
  3. Katie says

    at

    How many sunlight hours are needed for lettuce? I have a large south-facing window I’d like to try this on, in 4b Wisconsin.

    Reply
    • Anna says

      at

      Lettuce is a short-day plant, meaning 10-12 hours are good for it. Being so far north, we do not get that many hours. In Wisconsin, you are quite a bit south of us, you have longer days in the winter. You should be able to grow at least as good as we do.

      Reply
  4. Steve says

    at

    You did not list the air pump in your material list or what you add for nutrients.
    Could you expand on this?

    Reply
    • Anna says

      at

      We do not use an air pump, our big system has worked great so far without. But a small system could use one if the water is not circulating enough. For nutrients we like General Hydroponics MaxiGro, it is inexpensive and works great.

      Reply
  5. Frank says

    at

    What did you use for the green plate to restrict the water flow?

    Reply
    • Jakob says

      at

      I used a thin HDPE cutting board.

      Reply
  6. Denise says

    at

    I would like to make one oouf these but don’t understand the heating and pushing up one end to seal it. Could you show more pictures please? Is this a heat gun? how do you make it watertight? What about the A-connector facing up? Is that left open? You show it facing down into the flex pipe to go into the water container on the floor. Please share more pictures of the ends and how to link top and bottom rows.

    Reply
  7. Sheryl says

    at

    This is a great how-to article! I have added a link to the “Hydroponics Gardening” file in the Alberta Gardening group on Facebook, as it may inspire a few members. Thanks!

    Reply
    • Anna says

      at

      Thank you, Sheryl, appreciated it. It works so well in our sunny climate, but of course, san also be used without a window with grow lights.

      Reply
  8. Greg Cole says

    at

    Do you know if all the downspouts and other plastics are certified food grade or food safe?

    Reply
    • Anna says

      at

      No, we do not. Personally, we do not stress about it, since plastic seed starting containers and such are also not necessarily food grade. Just do best you can.

      Reply

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