Wilma Hydroponic Systems

The Atami WILMA XXL20 Tray (AW420TR) is an original replacement support and drainage tray for the Wilma XXL 20 hydroponic system. It supports the 20 pots above the nutrient reservoir and, thanks to its sloped design, returns excess nutrient solution by gravity back to the reservoir. Its dimensions are 115 × 115 × 20 cm, matching the square format of the Wilma XXL series. 

The AW420TR tray is designed as a direct replacement component for the Atami Wilma XXL 20 system. The pots sit on it, and nutrient solution draining after irrigation is collected and directed back to the reservoir, allowing it to be reused in the recirculating system. 

The configuration with 20 plant positions is suitable for arranging smaller pots more densely across an area of 115 × 115 cm. The tray itself is a replacement part - the reservoir, pots, pump and irrigation system are not included. The official Wilma XXL 20 system uses a 150 L reservoir and 20 pots of 6.5 L each. 

 Technical specifications

• Manufacturer: Atami / Wilma
• Model: Tray for Wilma XXL20
• Product code: AW420TR
• Type: Replacement support/drainage tray
• Dimensions: 115 × 115 × 20 cm
• Capacity: 20 pot positions
• Compatible system: Wilma XXL 20 Complete
• Official pot size in the system: 20 × 6,5 L
• Function: Supporting the pots and draining excess nutrient solution
• Drainage: Gravity-fed back to the nutrient reservoir
• Suitable for: Hydroponic and substrate growing with the Wilma XXL 20 system. 

🔄 How it works

In the Wilma system, the pots sit on the tray, and nutrient solution is delivered to each plant via drip irrigation. Excess water and nutrient solution drain through the pots and collect on the tray, from where they return to the reservoir. Atami designed Wilma as an automated drip system suitable for a range of substrates - including coco, peat mixes and hydroponic substrates. 

🔗 Compatibility

The tray is specifically intended for:

Atami / Wilma XXL 20 Complete 6.5L

The spare parts catalog identifies AW420TR specifically as the “Wilma XXL 20 pot tray” for this configuration. 

📦 Product contents

1 × Atami Wilma XXL20 replacement tray – AW420TR

⚠️ This is not a Wilma XXL20 kit. Pots, reservoir, pump, hoses, drippers, and the remaining irrigation system components are purchased separately if they are not already part of an existing system. 

System setup

Adjust the watering schedule to the substrate and the plants' development. Check the drip line, solution return, and reservoir level.

Browse Wilma systems.

Wilma 20

The Wilma 20 hydroponic system is lightweight, convenient to use and easy to transport. Pots of 6.5, 11 or 18 liters can be placed in any 4/8/10/16/20 tray. This gives the plants enough space to grow optimally. Wilma growing systems are lightweight and easy to move, yet stable, allowing plants to remain upright even when fully grown. Wilma growing systems are specially designed for professional growers! For 20 plants per 1 sq. m. Suitable for use with mineral wool, clay pebbles, coco or soil!

Dimensions: 119 cm long x 117 cm wide x 48 cm high

Reservoir capacity: 140 liters.

System setup

Adjust the watering schedule to the substrate and the plants’ stage of growth. Check the operation of the drip line, solution return and reservoir level.

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Wilma 4

The Wilma four-pot system is a drip irrigation system suitable for use with any substrate, whether soil, coco or clay pebbles. It is ideal for beginners as well as experienced growers. Drip-fed systems provide better results than traditional hand watering because plants have continuous access to the nutrients they need. The four-pot system uses a 30-liter reservoir with four 11-liter pots, although 3-liter Air-Pots or other suitable alternatives can also be used. The system measures 69 cm long x 58 cm wide x 43 cm high when used with the standard pots.

System setup

Adjust the watering schedule to suit the substrate and plant growth. Check the drip line, solution return, and reservoir level.

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Wilma 16

The Wilma 16 hydroponic system is lightweight, easy to use, and easy to move. Pots of 6.5, 11, or 18 liters can be placed in any 4/8/10/16/20 tray. This gives the plants enough space to grow optimally. Wilma growing systems are lightweight and easy to move, yet stable, allowing plants to remain upright even when they have grown tall. Wilma growing systems are specially designed for professional growers! For 16 plants per 1 sq. m. Suitable for use with mineral wool, expanded clay, coco, or soil!

Dimensions: 115 cm long x 115 cm wide x 20 cm high

Reservoir capacity: 150 liters.

System setup

Adjust the watering schedule to the substrate and the plants' growth stage. Check that the drip line is working, the solution is returning, and the reservoir level is correct.

Browse Wilma systems.