Growasis Double Decker Modular Raft System


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

Double your production with our Growasis Double Decker Modular Raft System.

The Base System comes with the complete modular framing system, endwall panels for plumbing connections, Duraskrim 20mm reinforced liner (cut to fit), and liner clips to fasten the liner to the frame. Plumbing and aeration kits are also included and assembled based upon the trough dimensions.  Our double deck systems also include low profile full spectrum LED lights underneath the upper deck for complete coverage of the lower planting trough. Please see the full kit description in the product details below.

Light Rack – Double decker systems can come with an optional light rack for the upper deck. Contact us for optimal lighting and light mover systems to best fit your environment and crops.

Raft Boards – The recommended number of 2×4′ Beaver Raft Boards will be displayed below.  To add raft boards to your order, click the Product Link at the bottom of the page. Enter the total number of raft boards you wish to purchase and Add to Cart. This allows you to purchase additional replacement boards and take advantage of volume pricing discounts.

Growasis Double Decker Systems currently come in 4′ widths. Select the desired length of your Growasis Double Decker Raft System including any options below.


Growasis Logo featuring head of lettuce on floating raft

Welcome to a new level in growing!

Growasis Double Decker Modular Raft systems allow you to double your production in the same footprint as our single deck systems. Double Deck systems are extremely scalable and can be connected to almost any aquaculture, aquaponic or hydroponic system.

The Growasis Double Decker System

Each Growasis Double Decker Modular Raft System comes with the following standard components.

Growasis Elevated Modular Frame

The Growasis Modular Framing System – Includes pre-cut 1″ galvanized metal pipes and the connector fittings required to assemble the trough based upon the dimensions you choose when placing your order. All visible framing parts including the optional light rack are powder coated white. Custom powder coating colors are available. A single 1/2″ plywood end wall panel comes with each frame to provide a back board for mounting bulkhead fittings.  All pipe is cut to fit in our shop and ready to assemble with our easy to follow instructions. The base level system does not include any bulkhead or plumbing fittings as some may want to plumb their own recirculating system using their own parts. For that reason we offer the plumbing and aeration kit as an optional component.

LED Grow Lighting – Every one of our Growasis Double-Decker systems comes standard with LED grow lighting included for the bottom tier to create an optimal growing condition for your plants.  We use three rows of Thrive Agritech’s Infinity 2.0 full spectrum LED grow lights, an efficient, powerful, and waterproof fixture.  These modular 65 watt LED strips are configured to provide perfect light intensity and uniformity, while producing a white light to the human eye that is comfortable and easy to work around. Depending on your location, energy rebates may be available to discount the cost of the lighting system.

Duraskrim 20mm Liner – Liner is cut in our production facility to fit the length and width of your trough. We provide some excess liner on the length which should be carefully trimmed with a utility knife 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.

Plumbing and Aeration Kit – Kits include heavy duty bulkhead fittings for all plumbing and airline connections.

Growasis Elevated DWC Plumbing

All plumbing connections are designed to go through the bulkhead connection panel at one end of the raft system. This allows for a cleaner installation and minimizes tripping hazards by organizing all of the plumbing on one end of the trough. A 1″ PVC swing check valve assembly connects to an 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 line assembly removes water from inside the trough to a 2″ Fernco Tee on the floor. This allows for a simple connection to a 2″ pipe to return water to your own nutrient reservoir or sump. An additional valved clean-out assembly allows you to connect a standard garden hose to the end of the line should you need to flush the line. Depending on the location of your nutrient reservoir or sump, you will have to provide the necessary lengths of supply and return pipe necessary to make those connections.

The aeration kit includes the recommended number of air stones (approximately 1 every 4 ft), a distribution ring, bulkhead connection and an Alita low noise linear air pump for aeration. All of the plumbing components are easy to connect following the supplied instructions (no gluing is required). Depending on the size of the application we may recommend a larger air distribution or a centralized aeration system. Contact us to tell us more about your project and we can provide the best fit solution.

Optional Components

Beaver Floating Raft Boards –  Beaver boards are food grade growing rafts designed specifically for aquaponic and hydroponic lettuce production. Boards are 1″ thick and 2′w x 4′l and come pre-drilled with 28 tapered holes. When you input your system dimensions you will see the number of Beaver Raft boards required to cover the entire trough. Since many people like to add a few additional boards or receive quantity price breaks, the boards are 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.

Items Not Included in Your Purchase

Some 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 or greater to prevent sagging and potential breakage due to the water weight. The number of 4×8′ 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.

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 for your Growasis system and we will be able to assist you in properly sizing the pump. In general we recommend a flow rate that can circulate the total water volume of your plant system approximately once every 3 to 4 hours. Important note: recirculation for your fish tanks should happen at a rate closer to one full tank exchange every 30 to 60 minutes.