Mother Earth® Hydroton® Original Expanded Clay Pebbles 10L — 18-16mm

Mother Earth Hydroton Original Expanded Clay Pebbles 10L — 18-16mm

Mother Earth Hydroton Original Expanded Clay Pebbles are manufactured in Germany by Fibo ExClay from natural clay that is kiln-fired at high temperature to create a lightweight, porous, structurally stable growing medium. The 18-16mm sizing delivers a specific balance of drainage, aeration, and root anchoring for hydroponic, aeroponic, and soilless growing environments, and the 10L format provides a quantity suited to everything from small DWC systems to larger ebb and flow installations.

Hydroton is fully reusable — it can be rinsed, sterilized, and redeployed across multiple growing cycles, which makes it a cost-effective, long-lasting growing medium option for indoor cultivation.

Key Features & Benefits

• German-Manufactured Clay Aggregate: Produced by Fibo ExClay in Germany using a kiln-fired expanded clay process for consistent particle quality.
• 18-16mm Sizing: Provides pore space for root zone oxygenation and drainage suited to this size range's intended use.
• pH Neutral: Chemically inert and will not alter the pH of your nutrient solution.
• Excellent Drainage & Aeration: The porous, irregular structure creates a large air-to-water ratio in the root zone.
• Fully Reusable: Can be rinsed, sterilized, dried, and reused across subsequent growing cycles.

Who Should Use This

Hydroton Original is a growing media choice for DWC, ebb and flow, drip-to-waste, NFT, and aeroponic system operators, as well as soil and coco growers who use clay pebbles as a drainage layer or top dressing. The 10L format suits both home hydroponic growers and larger indoor cultivation setups.

Compatibility

Compatible with all hydroponic system types, including DWC, ebb and flow, NFT, drip systems, and aeroponics. Can be used standalone or blended with coco coir, perlite, or other soilless components, and will not alter pH or nutrient solution chemistry in any of these applications.

About Mother Earth

Mother Earth is a Hawthorne Gardening Company brand, now under Vireo Growth, and Hydroton is manufactured in Germany by Fibo ExClay.

Frequently Asked Questions

Do I need to rinse Hydroton before first use?

Yes. Rinse Hydroton thoroughly with clean water before first use to remove clay dust and fine particles left over from manufacturing and packaging. Soaking in pH-adjusted water (pH 5.5-6.5) for a few hours beforehand also helps pre-condition the media.

How do I clean and reuse Hydroton between cycles?

After harvest, remove as much root matter as possible from the pebbles, then rinse thoroughly with clean water. Soak in a hydrogen peroxide solution or a commercial growing media cleaner to sterilize, rinse again, and let the media dry completely before storing it for reuse.

Is Hydroton suitable for organic growing?

Hydroton is an inert clay medium and does not itself contribute organic matter or nutrients to a growing system. It works fine as a physical substrate in an organic hydroponic setup when paired with an approved organic nutrient program.

What is the difference between the 18-16mm Original and 15-25mm Giant sizes?

The 18-16mm size in this listing provides a particular balance of pore space, drainage, and root anchoring for its stated use case. Mother Earth also offers Hydroton in the other size (15-25mm Giant) for growers who want a different aggregate size for the same clay pebble medium.

Can Hydroton be used in soil-based growing as a drainage layer?

Yes. Adding a shallow layer of Hydroton at the bottom of a soil or coco container improves drainage and helps prevent waterlogging at the root base. It can also be used as a top dressing to reduce surface evaporation.