Growasis Elevated Modular Raft Systems

Photo of Growasis Raft System Logo featuring head of lettuce on floating lettuce raft

Elevate your plants with our Growasis Elevated Modular Raft System.

Growasis Elevated Systems come in 2′, 4′, 6′ and 8′ widths and variable lengths in 4′ increments. Please contact us for a quote. See details below.


Growasis Logo featuring head of lettuce on floating raft

Welcome to a new level in growing!

Growasis Elevated Modular Raft systems bring your floating aquaponic or hydroponic garden up to a comfortable working height. Raft systems are extremely scalable and can be connected to almost any aquaculture, aquaponic or hydroponic system.

The Growasis Elevated System Features

No Cutting or Drilling Required! – Our complete framing system includes pre-cut lengths of galvanized metal pipe and all the connector fittings required to assemble the trough. Pipes simply slide into the fittings and tighten with the supplied hex wrench.  A pre-cut 1/2″ plywood end wall assembly comes with each frame to provide a back board for mounting bulkhead fittings.

No Exposed Sharp Metal Edges! – The Growasis line of DWC troughs has no sharp metal edges anywhere which is not the case with other DWC systems on the market. If you have ever worked in an aquaponic or hydroponic farm, you know that you’re walking alongside these troughs frequently. Cutting your leg on exposed metal framing is easy to do, very painful, and creates a serious food safety risk. Our troughs are smooth all the way around and easy to wipe down and clean.

Powder Coated Pipes and Connectors – Any pipes or fittings that are visible or touch the ground, are powder coated white for a high quality appearance and rust protection.

Duraskrim 20mm Liner – Liner is cut in our production facility to fit the length and width of your trough. We provide some excess length which should be carefully trimmed following the installation procedures once the system is fully assembled.

PVC Liner clips (4′) – Liner clips are provided to correspond to the length and width of your troughs. Liner clips snap down and secure the liner to the top rail. Liner clips provide a smooth round finish and are easily cleanable.

Production Metrics

Lengths can exceed 100′ as needed
*assumes 28 hole 2′ x 4′ Beaver Raft Boards.
** assumes a 4 week transplant to harvest cycle. Results can vary based on lighting, nutrients, temperature and management.

Optional Components

Beaver Floating Lettuce Raft Boards – Beaver boards are food grade rafts designed specifically for aquaponic and hydroponic lettuce production. Boards are 1″ thick and 2′ x 4′ and come pre-drilled with 28 tapered holes.  Since many people like to add a few additional boards or receive quantity price breaks, the boards can be purchased separately on the Raft Boards Product Page

Optional Light Rack – Our 4′ wide elevated troughs can include a heavy duty lighting mount for overhead stationary or track lighting systems. The light rack is made from the same powder coated metal and fittings as the base frame. Contact us for optimal lighting and light mover systems to best fit your system, crops and location.

Plumbing and Aeration Kit – Plumbing and aeration kits are specifically designed based upon the system dimensions you choose. If you are adapting to an existing system please feel free to contact us to discuss your plumbing requirements. Our standard kits include the following:

  • Heavy duty EPDM bulkhead fittings for all plumbing and airline connections. All plumbing connections secure through the end wall panel at one end of the trough. This allows for a cleaner installation by organizing all of the air and water supply and return plumbing in one location.
  • A swing check valve assembly connects to your incoming water pump supply to prevent backflow through your pump in the event of a power outage.
  • Distribution piping inside the trough carries water to the opposite end of the trough and directs it back towards the outlet.
  • A 2″ drain assembly removes water from inside the trough to a 2″ Fernco Tee on the floor. The fernco tee allows for a simple connection to a 2″ pipe to return water to your own nutrient reservoir or sump. Depending on the location of your nutrient reservoir or sump, you will have to provide the necessary lengths of supply and return pipe.
  • A valve controlled clean-out assembly allows you to connect a standard garden hose to the end of the line should you need to flush the pipes.

The Aeration Kit includes the following components:

  • An Alita ultra quiet linear air pump sized to provide the proper CFM and PSI for the number of air diffusers in your trough. The air pump includes a pressure release valve.
  • Air Diffusers are included and placed approximately every 4 ft along each side of the trough length.
  • Matala weighted air distribution tubing that stays down at the bottom of the trough. The air distribution is arranged in a ring configuration for uniform air pressure throughout the trough. Depending on the size of the application we may recommend a larger air pump or a centralized aeration system. Contact us to tell us more about your project and we can provide the best fit solution.

Items Not Included in Your Purchase

Elevated and Double Decker Growasis systems require 3/4″ thick plywood and/or foam insulation panels. These items are not practical and affordable to ship.

In the case of Growasis Elevated or Double Decker systems, you will need to pick up one or more 3/4″ x 4′ x 8′ sheets of OSB plywood for the liner support. Only use OSB plywood at the recommended thickness to prevent sagging and potential breakage due to the water weight. We will indicate the number of plywood boards you need based on your system dimensions. Should you require insulation panels for your trough use only 1″ x 4′ x 8′ standard foam board insulation.

We do not include a water pump or sump tank as part of the standard plumbing package. The proper pump sizing will be dependent on a number of factors. Please contact us if you need to purchase a pump and sump for your Growasis system.

How much can my Growasis Modular Raft System Grow?2022-02-03T12:51:18-07:00

This will depend on a variety of factors such as available light, nutrients, humidity, water and air temps, pH, oxygen and air flow to name a few! Each Growasis product page has production tables showing estimates of annual and weekly plants based upon the size of the system. For maximum production we recommend seeding, transplanting and harvesting on a consistent basis, The frequency of these activities will depend on the environmental factors noted above along with other potential sales, distribution and market factors.





Why Local Pickup?2019-03-03T20:41:13-07:00

Short Answer: Some Growasis systems require 3/4″ thick plywood and/or foam insulation panels. These items are not practical to ship.

In the case of Growasis Elevated or Double Decker systems, you will need to pick up one or more 3/4″ x 4′ x 8′ sheets of OSB plywood for the liner support. Only use OSB plywood at the recommended thickness or greater to prevent sagging and potential breakage due to the water weight. The number of boards you need will be indicated by the dimensions you input into the design calculator on each Growasis product page.

Should you require insulation panels for your trough use only 1″ x 4′ x 8′ standard foam board insulation.

Will I need any special tools or cutting equipment?2019-03-03T14:39:05-07:00

Short answer: It depends on which Growasis you choose and the length of the system.

The tools you might need are (Circular Saw, Utility knife)

Our Growasis elevated and double decker systems require you to purchase 3/4″ OSB plywood paneling to support the liner and water weight. Modular systems starting at 8′ lengths and increasing by 8′ lengths (8′, 16′ 24’…) will not require any cross cuts of the plywood. However, modular raft systems starting at 12′ and increasing by 8′ lengths (12′, 20′, 28’…) will require one of the panels to be cut as a 4×4′ section. When you pickup your plywood check with your local supplier (ie Home Depot or Lowes) as they may provide free cuts on site so you don’t have to.

Our 2′ wide Growasis Elevated Raft Systems will require a 2′ wide piece of plywood. In this case a rip cut lengthwise through the plywood will be required. Again check with your local supplier. Otherwise any plywood cuts can be performed with a circular saw following the directions and equipment safety recommendations.

For Growasis Ground Level Systems we strongly recommend laying full size rigid insulation panels (1″ x 4′ x 8′) on the ground between the framing system. This will help to keep your water from losing valuable heat into the ground below. For 8′ wide troughs, the frame is designed to allow for two full size sheets to fit between each 8′ cross bar support without needing to cut the insulation panels.

You also have the option to add 1″ insulation panels into the sidewalls between the vertical support pipes. These panels can be cut to fit with a utility knife according to the directions. This must be done before installation of the liner.

How much is shipping?2018-12-18T06:32:44-07:00

That depends on the size of your Growasis Floating Plant System. When you place your order we will contact you with a freight estimate to your shipping address.

Can I install the Growasis System myself?2018-12-18T04:56:23-07:00


We’ve made the framing system super easy to install. You can even move the frame around (before water is in) to get it positioned exactly where you want it. We have an installation video and manual to guide you through the process. All pipes are pre-cut and labeled so you know how to fit everything together. The metal fittings secure to the pipes with a simple hex key (supplied) or you can use a drill with a 5/16″ hex bit to make it go even faster. Should you be using insulation panels for the sidewalls you will need to cut those to fit between the pipes following the directions.

The Duraskrim liner installs over the framing system. Depending on the size of your trough it may be helpful to have some extra hands for the liner install so you can carefully guide and position the liner onto the frame. Once the liner is installed (following the supplied directions) you can insert the bulkhead fittings through the liner and endwall panel(s).

Depending on the size of the Growasis Plant System you purchased, you can have yours built and ready to fill with water in less than an hour. As always, we are here to help and want to make sure your installation goes smoothly. Please reach out to us if you have any questions.


What are the benefits of Deep Water Culture?2018-12-18T04:41:17-07:00

There are a lot of ways to grow crops so why grow in deep water?

  • Plants don’t die when the power goes out – This cannot be claimed with any vertical or NFT based growing system. In our DWC troughs, plant roots are constantly submerged in nutrient rich water staying hydrated even during an extended power loss or pump failure.
  • Precise crop spacing – We use Beaver Plastics food grade lettuce rafts boards that have evenly spaced, pre cut and tapered holes for planting seedlings. For example, a 28 hole raft board will allow you to plant up to 3.5 plants per sq ft. This is important particularly for commercial growers who are producing specific quantities for market. Production and financial metrics can be easily determined. Plant spacing can be modified depending on the type of crops.  
  • Thermal Mass and Stability – Water is the best source of thermal mass. In other words, it retains heat extremely well compared to other materials. The large volume of water in a Growasis Floating Raft System provides greater buffering capacity and stability in water temperature, pH and other water quality parameters. A large volume of water can also help to passively heat and cool your growing environment.
  • Easy Planting and Harvesting – Crops can easily be transplanted from a nursery directly into the raft boards. Harvesting can be done right on the raft boards at the trough or the raft boards can be picked up and moved to a convenient height and location for harvesting. Our Growasis elevated systems make it even easier by being conveniently positioned at waist height. 
  • Proven Technology and Results – Deep water culture growing has been around for decades and has been proven as an excellent growing method through extensive research and commercial applications. Our farms have used deep water growing systems for years and they have been the preferred growing method among all of our farmers producing thousands of crops every week.    
How do Growasis Modular Raft Systems compare with others?2019-03-03T15:00:06-07:00

There are a few other DWC systems on the market and usually they are sold as part of a complete farm package. Here are a few features of other systems to watch out for and how ours compare.

The Framing System – Other DWC troughs on the market use way too much expensive metal framing and fittings then are necessary. This increases the cost and complexity of your troughs. In addition, you have to fasten the framing system together with self tapping screws which requires an impact driver and leaves metal shards everywhere.  In some DWC framing systems the sharp metal frame edges are fully exposed on the outside of the trough showing the insulation panels. This is very unsightly and you could easily cut yourself when working along side the troughs.

Growasis troughs have no sharp edges, no cutting or drilling and no visible insulation boards.

Growasis Floating Plant System








Raft Boards

Other DWC systems on the market require you to purchase your own insulation panels to be used as floating plant rafts. There are so many things wrong with this it’s hard to know where to start. Here’s a quick bullet list of issues.

  • Manufacturers of insulation panels (like Dow) have publicly discouraged the use of insulation boards for plant or food production yet suppliers continue to promote their use.
  • Pink or blue insulation boards are not ideal as they do not reflect the light back to the plants as the white boards do. There are suppliers who even recommend painting the insulation boards so they can be white. This practice is a waste of time and now you have latex paint peeling off your boards and getting into your food production system. Not good…
  • When using insulation boards you have to not only cut all the boards but then you have to drill potentially thousands of little holes which creates a huge mess and is extremely labor intensive! This is arguably one of the worst things we’ve ever had to do in our early years in aquaponics. Why drill holes in insulation boards when there is an affordable food grade and pre-drilled solution already out there?

EPDM pond liner

Some suppliers also use heavy duty 45mm black EPDM pond liner for their troughs. This type of liner is extremely heavy and difficult to work with compared to the light weight 20mm structurally reinforced DuraSkrim liner. EPDM is great for lining ponds because it stretches and forms well to uneven surfaces but that feature as actually a drawback in DWC applications. Duraskrim liner is also white which is a good thing because it allows you to easily see your airstones and any accumulation of detritus in your troughs. EPDM is also a petroleum based product which is not recommended in food production applications.

Only virgin resins are used in the production of the DuraSkrim. All resins used in the food contact layer are FDA 21 CFR 177.1520 (c) 3.2 compliant.  “Dura-skrim has been approved as a material in organic farming.”

Jeff Evard
Certification Manager
Ecocert ICO LLC

Resources are being developed from this product. Please contact us for more information.

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