GROW!T Clay Pebbles, 4 mm-16 mm, 40 L

Stable, Natural Drainage Media for Hydroponic Systems

This 40 liter bag of GROW!T horticultural clay pebbles is made from 100% natural clay, giving growers a clean, pH stable medium with strong aeration and drainage for flood and drain, deep water culture, and drip feed systems.

The pebbles' unique structure and large surface area create an ideal environment for beneficial bacteria to establish around the root zone, while the sturdy structure resists breaking down and clogging drippers over repeated cycles.

Key Features & Benefits

• 100% natural clay — produces a clean, pH and EC stable growing medium
• Pre-washed pebbles — reduces dust and aids stability before use
• Free-draining structure — maintains good oxygen levels around the root zone
• Sized 4mm to 16mm, 40 liter bag — fits flood and drain, DWC, multi-pot, and drip systems

Who Should Use This Medium

Hydroponic and hydroculture growers who need a stable, reusable drainage medium for flood and drain, deep water culture, drip feed, or aquaponic systems, as well as gardeners mixing clay pebbles into coco coir or soil for added aeration.

Mixing Guidance

When using clay pebbles for aeration of growing media, mix at a rate of 4 parts clay to 7 parts soil or coco coir to loosen the structure and support better root development.

Frequently Asked Questions

What is this medium made from?

100% natural clay, pre-washed and sized between 4mm and 16mm.

Which systems is this suited for?

Flood and drain, deep water culture, drip feed, multi-pot, and aquaponic systems.

Can I mix it into soil or coco coir?

Yes, mix at roughly 4 parts clay to 7 parts soil or coir to improve aeration.

Will the pebbles break down or clog my drippers?

No, the strong structural integrity resists breaking apart and compacting over time.

Does this medium affect pH or EC?

No, it is extremely stable in both pH and EC, so it will not shift your nutrient solution.