- 1x RDWC Circulation Water Pump 30
- 1x RDWC Header Pot Complete
- 21x RDWC Pot 20L
- 22x Silver Lid
- 1x Header Pot Blank
- 21x Square Net Pot
- 21x Air Injection Ring
- 4x Elbow 50mm Dual Flow
- 36x 50mm Straight Dual Flow
- 3x Tee 50mm Dual Flow
- 43x Washer 50 X 64mm
- 43x Nut 50mm Dual Flow
- 2x RDWC Tee, Ball Valve and Filter
- 2x Tee 16mm Barbed
- 3x Plug - 16mm
- 2x Elbow 16mm Barbed
- 21x Tee 16mm - 6mm Blue
- 21x Pot Clip 16mm
- 1x Tee 19mm Barbed
- 15x Pipe 6mm Blue Bulk by Meter
- 17x Pipe 16mm Silver Bulk by Meter
- 6x Pipe 19mm Blue Bulk by Meter
- 2x Pipe 50mm Silver 100cm Piece
- 13x Pipe 50mm Silver 66cm Piece
- 1x Wrench 50mm
- 1x Pipe Cutter 50mm
- 1x RDWC Instructions
Alien Hydroponics RDWC - 21 Pot 3 Row
starting from 0% interest financing from
/mo.
- Uses a high-flow 30-series pump to recirculate nutrients through all 21 pots every few minutes.
- Oversized 2-inch Dual-Flow fittings prevent root blockages and maintain consistent flow.
- Modular 3-row configuration allows for compact or remote header placements to fit your room.
- 1-year manufacturer's warranty
- View More Details
Shipping Calculated at Checkout
Earn 2,215 points for shopping and get $22.15 off your next order. Join Harvest Club for free.
Over 50,000 Customers
Trust Trimleaf
Transparent Pricing
Backed w/ price match guarantee
4.8/5 Rating
1938+ verified reviews
Secure Checkout
SSL encrypted payments
More in this Series
VOLUME PRICING
Commercial & Bulk Purchasing
We support operations & licensed facilities with volume pricing, dedicated account managers, and custom equipment consultation.
Who This Is For
- You are moving to a 21-pot layout because managing individual reservoirs for a large canopy requires too much labor.
- You are upgrading to 2-inch fittings because your root masses are thick enough to clog standard lines.
- You are switching to a recirculating setup because you need nutrient levels to stay uniform across all 21 pots.
What We Found
- We noticed the 2-inch fittings are a massive upgrade because they won't clog even when roots get thick and unruly.
- Those silver lids look flashy but they actually keep reservoir temps a few degrees lower than standard black lids.
- Use the included pipe cutter for your first build to ensure every connection is perfectly flush and leak-free.
What Users Say
- Growers who moved from hand-watering say they finally have their weekends back since the system handles the feeding.
- Commercial teams reported shaving a full week off their vegetative stage thanks to the constant oxygen at the roots.
Alien Hydroponics RDWC - 21 Pot 3 Row
Achieving commercial-scale yields shouldn't require a degree in engineering. The Alien Hydroponics RDWC 21 Pot 3 Row system solves the complexity of large-scale hydroponics by providing a high-performance, recirculating deep water culture setup that is as easy to maintain as it is productive. Designed to super-oxygenate your nutrient solution, this system ensures your roots are always bathed in the perfect environment for explosive growth.
Whether you are a professional cultivator or an ambitious home grower, this RDWC hydroponic system eliminates the risks of nutrient stagnation and oxygen deficiency. For those working with slightly smaller footprints, the Alien Hydroponics RDWC 12 Pot 3 Row offers the same commercial-grade technology in a more compact configuration. Built with the signature quality of Alien Hydroponics, this 21-pot layout is the gold standard for maximizing canopy coverage and yield consistency.
What's Included
Features
🌱
Accelerated Growth & Higher Yields
Reduces vegetative time and accelerates flowering for faster, larger harvests.
💧
Clog-Resistant Dual-Flow™ Fittings
Oversized 2" fittings minimize root blockage for consistent nutrient delivery.
🔗
Flexible & Scalable Design
Modular system adapts to various grow sizes, allowing for easy customization and expansion.
💸
Efficient Nutrient Management
Requires minimal medium and recirculates solution, reducing setup and operational costs.
💨
Superior Root Oxygenation
JET-STREAM A.I.R.™ rings provide constant, high-pressure oxygen for healthy root development.
🛠️
Easy Setup & Maintenance
Threaded fittings and snap-on pipes allow for a glue-free setup and easy reconfiguration.
🛡️
Heat-Reflective & Durable
Heat-reflective silver polymer maintains cooler solution temperatures for optimal root health.
⚙️
Customizable Configurations
Offers numerous options to maximize growing space with remote headers and multiple pot sizes.
Setup and Maintenance
System Setup Steps:
1. Prepare Pots
Attach the necessary fittings to the pots.
2. Connect the System
Establish a recirculating network by connecting the pots and header pot with silver piping.
3. Install Air System
Connect the air pump to the JET-STREAM A.I.R.™ rings located in each pot.
4. Integrate Pumps
Install the water pump for consistent recirculation and nutrient delivery.
5. Set Up Nutrient Tank
Connect your external nutrient tank to the system header.
6. Fill the System
Add water and check for the correct fluid level before activating the pump.
Maintenance Tips:
- Maintain nutrient solution temperatures between 18-20°C (64-68°F).
- Recirculate nutrients thoroughly before testing and adjusting pH/EC levels.
- Ensure the net pot substrate is properly watered during the initial planting phase.
- Use the designated drainage fitting for periodic system flushes.
- Apply preventative root health solutions to maintain a clean internal environment.
Specifications
| Specification | Value |
|---|---|
| Number of pots | 21 |
| Number of rows | 3 |
| Kit total fluid volume (20L Pots) | 93 gallons / 352 liters |
| Kit total fluid volume (36L Pots) | 164 gallons / 620.8 liters |
| Minimum Assembled Size (Compact Header, 20L) | 113" (L) x 48⅞" (W) |
| Maximum Assembled Size (Remote Header, 20L) | 209" (L) x 100" (W) |
| Water Pump Included | RDWC Circulation Water Pump 30: 500 GPH, 45 Watts |
| Air Pump (Required) | Minimum 55.5 GPM / 210 LPM |
Support & Manuals
Warranty
The Alien Hydroponics RDWC system comes with a one-year manufacturer's warranty for your peace of mind.
FAQs
What is the main advantage of an RDWC system?
Recirculating Deep Water Culture (RDWC) systems constantly circulate a highly oxygenated nutrient solution through the plant's root zone. This process, also known as Deep Water Culture, promotes explosive root growth, leading to faster vegetative cycles and significantly larger yields compared to traditional soil or other hydroponic methods.
Is this 21-pot system difficult to set up?
No, the Alien Hydroponics RDWC system is designed for straightforward assembly. It features threaded fittings and snap-on pipes that require no glue, making setup, breakdown, and reconfiguration simple. Detailed instructions are included to guide you through the process.
What's the difference between the 20L and 36L pot options?
The primary difference is the volume available for root development. The larger 36L (9.5 gallon) pots are ideal for growing larger plants with extensive root systems, while the 20L (5 gallon) pots are excellent for medium-sized plants or situations where space is more limited.
Can I expand or modify this system later?
Absolutely. The modular design is a key feature of the Alien RDWC systems. You can easily add more pots, adjust spacing, or reconfigure the layout to fit a new grow space or expand your operation as your needs evolve.
What makes Alien Hydroponics systems different from others?
The Alien Hydroponics brand focuses on innovation. Key differentiators include the patent-pending Dual-Flow™ fittings that prevent root clogging, super-efficient JET-STREAM A.I.R.™ rings for maximum oxygenation, and heat-reflective silver polymer construction.
Is a 21-pot system suitable for a beginner?
This 21-pot system is designed for serious, large-scale cultivation. While its user-friendly design makes it manageable, a complete beginner might find a smaller system less intimidating. We recommend starting with a more compact kit, such as the Alien Hydroponics RDWC 12 Pot 2 Row, to get familiar with the RDWC method before scaling up.
Happy To Help
Questions About This Product?
Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)
Why Trimleaf
Equipping home growers, craft producers, and commercial operations across North America since 2016.
10+
Years of Specialist Knowledge
4.8★
Over 1,900 Verified Reviews
50,000+
Growers Served
120+
Top Equipment Brands in Stock