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

Stable, Natural Drainage Media for Hydroponic Systems, 40 Liter

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.

This 40 liter size is scaled for growers managing multiple systems or larger containers who need a bulk supply of stable, reusable drainage medium on hand.

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 — 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.

About GROW!T

GROW!T is a Hydrofarm exclusive brand offering soilless growing media, including coco coir, graded perlite, and clay pebbles built to stay pH and EC stable across flood and drain, deep water culture, and drip feed systems.

Frequently Asked Questions

What is this medium made from?

It is 100% natural clay, pre-washed and sized between 4mm and 16mm. Pre-washing reduces the fine dust that can cloud reservoirs on first use.

Which systems is this suited for?

Flood and drain, deep water culture, drip feed, multi-pot, and aquaponic systems. Its stable pH and EC make it a fit for recirculating setups where a shifting medium would otherwise throw off nutrient balance.

How do I mix it into soil or coco coir?

Mix at roughly 4 parts clay to 7 parts soil or coir to improve aeration. That ratio loosens the growing medium's structure without diluting its water-holding capacity too far.

Will the pebbles break down or clog my drippers?

No, the strong structural integrity resists breaking apart and compacting over time. That durability is what lets the medium be rinsed and reused across multiple growing cycles.

Does this medium affect pH or EC?

No, it is stable in both pH and EC, so it will not shift your nutrient solution. That stability is especially useful in recirculating systems where the medium stays in continuous contact with the reservoir.