Quick Answer

50L bulk format, each pellet 16mm to 25mm, kiln-expanded for a porous, inert structure.
Reusable across multiple grow cycles and resistant to contamination, unlike single-use media.
Best suited to larger hydroponic systems and commercial-scale operations, not small single-pot setups.
Ships fast from within Australia.

Clay Balls (LECA) 50L. Hydro Expanded Clay Hydroponic Growing Medium for High-Aeration Root Systems

Hydro Expanded Clay 50L is a bulk hydroponic growing medium built for maximum root oxygenation, rapid drainage, and stable plant development across soil-less systems. Each pellet measures 16mm to 25mm and is produced by kiln-expanding natural clay, forming a porous, inert structure that maintains the right balance of air, moisture, and root support.

The 50L format is ideal for larger hydroponic systems, commercial applications, and indoor growers scaling production. Reusable, contamination-resistant, and consistent across multiple growth cycles.

Key Benefits

50L Bulk Volume. Ideal for large grow systems and high plant counts.
16mm to 25mm Pellet Size. Optimised for airflow, drainage, and root anchoring across all major hydroponic systems.
Highly Porous LECA Structure. Maximises oxygen availability to roots and prevents anaerobic conditions.
Excellent Drainage Profile. Prevents waterlogging and root rot in recirculating and drain-to-waste systems.
Inert and pH Neutral. Compatible with all nutrient programs without interference.
Reusable Growing Media. Wash and sterilise for multiple cycles, reducing ongoing media costs.
Mould and Pest Resistant. Cleaner root zone compared to organic media.
Thermal Buffering. Helps stabilise root zone temperatures across seasonal variation.

How It Works

Hydro Expanded Clay pellets (16mm to 25mm) are kiln-fired at high temperatures, creating a rigid porous shell around a lightweight core. This structure retains surface moisture between irrigation cycles while draining excess water freely, maintaining the three critical root zone variables: oxygenation, moisture availability, and physical root support. The inert composition ensures zero nutrient interference, making it compatible with any nutrient program from seedling through to harvest.

System Features

16mm to 25mm pellet size for the right air-to-water ratio
Inert and pH neutral. No buffering required before use beyond a rinse.
Reusable after sterilisation with a hydroponic cleaner
Lightweight aggregate reduces system load and handling fatigue
Compatible with all recirculating and drain-to-waste hydroponic systems

Applications

Deep Water Culture (DWC)
Ebb and Flow (Flood and Drain)
Drip Irrigation Systems
Semi-Hydro Indoor Plant Systems
Aquaponics Systems
Commercial scale hydroponic production

What Sets It Apart

At 16mm to 25mm, Hydro Expanded Clay sits in the ideal size range for most hydroponic net pots and grow sites. Smaller pellets compact and restrict airflow. Larger pellets reduce root contact and anchoring. This size delivers the right balance for fast root colonisation, stable plant support, and consistent drainage performance across all system types.

Frequently Bought Together

Commonly paired with Hydro Expanded Clay 50L for complete system builds:

Technical Specifications

Brand. Hydro Expanded Clay
Volume. 50 Litres
Pellet Size. 16mm to 25mm
Material. Kiln-Fired Expanded Clay Aggregate
Structure. Porous Lightweight Pebbles
Function. Root Aeration and Drainage
Water Retention. Low to Moderate
Aeration. High Oxygen Root Zone
pH Stability. Neutral / Inert
Reusability. Reusable After Cleaning
Application. Hydroponics, Indoor Plants, Aquaponics
Contamination Resistance. Mould and Pest Resistant
Shipping Weight. Approx. 20kg

Frequently Asked Questions

Do I need to prepare Clay Balls (LECA) 50L before using it?

Yes. Rinse until the water runs clear, then soak for 6 to 24 hours in pH 5.8 to 6.2 water. The dust will cloud a reservoir and can block pumps and drippers if you skip this.

LECA vs perlite vs coco: which should I use?

LECA drains fastest and holds the most air, so it suits DWC, ebb and flow and recirculating systems where roots sit close to water. Perlite is lighter and cheaper but floats and breaks down, so it works best mixed into coco or soil rather than on its own. Coco holds the most water and is the most forgiving, which suits hand-watered pots and drip-to-waste. See the full range in our grow media collection.

Can I reuse Clay Balls (LECA) 50L?

Yes. Expanded clay can be sterilised and reused for many cycles. Remove old roots, rinse thoroughly, soak in a hydrogen peroxide or 10% bleach solution, then rinse again with clean water and re-soak in pH-adjusted water before reuse.

What nutrient solution pH should I use with Clay Balls (LECA) 50L?

Target pH 5.8 to 6.2 for coco and hydro inert media. Soil users should target 6.0 to 6.5. Keeping pH within this range keeps all macro and micronutrients soluble and available to plant roots. Use a calibrated pH pen and adjust with pH Up or pH Down solution as needed after mixing your nutrient solution.

Does Clay Balls (LECA) 50L ship fast within Australia?

Yes, Clay Balls (LECA) 50L ships from within Australia with fast tracked delivery Australia-wide. Most orders to VIC, NSW, QLD, SA and ACT arrive within 2 to 5 business days. WA, NT, and TAS orders typically arrive within 5 to 12 business days.