---
product_id: 9688088
title: "GROW!T GMC40l - 4mm-16mm Clay Pebbles, Brown, (40 Liter Bag) - Made from 100% Natural Clay, Can be used for Drainage, Decoration, Aquaponics, Hydroponics and Other Gardening Essentials"
brand: "hydrofarm"
price: "1884 kr"
currency: DKK
in_stock: true
reviews_count: 8
category: "Hydrofarm"
url: https://www.desertcart.dk/products/9688088-grow-t-gmc40l-4mm-16mm-clay-pebbles-brown-40-liter
store_origin: DK
region: Denmark
---

# 100% Natural Clay Drains Freely 40 Liter Capacity GROW!T GMC40l - 4mm-16mm Clay Pebbles, Brown, (40 Liter Bag) - Made from 100% Natural Clay, Can be used for Drainage, Decoration, Aquaponics, Hydroponics and Other Gardening Essentials

**Brand:** hydrofarm
**Price:** 1884 kr
**Availability:** ✅ In Stock

## Summary

> 🌿 Elevate Your Gardening Game with GROW!T!

## Quick Answers

- **What is this?** GROW!T GMC40l - 4mm-16mm Clay Pebbles, Brown, (40 Liter Bag) - Made from 100% Natural Clay, Can be used for Drainage, Decoration, Aquaponics, Hydroponics and Other Gardening Essentials by hydrofarm
- **How much does it cost?** 1884 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/9688088-grow-t-gmc40l-4mm-16mm-clay-pebbles-brown-40-liter)

## Best For

- hydrofarm enthusiasts

## Why This Product

- Trusted hydrofarm brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **🚫 No Floating:** Once wet, these pebbles stay put, ensuring your plants remain anchored and thriving.
- • **🔄 Versatile Use:** Ideal for drainage, decoration, aquaponics, hydroponics, and all your gardening needs.
- • **💨 Optimal Aeration:** Designed to enhance oxygen levels around roots, promoting healthier plant growth.
- • **🌍 Eco-Friendly Choice:** Crafted from 100% natural clay, perfect for the environmentally conscious gardener.
- • **🧼 Pre-Washed Stability:** Pre-washed to ensure stability in pH and EC, making it a reliable choice for your plants.

## Overview

The GROW!T GMC40l Clay Pebbles are a premium gardening essential made from 100% natural clay. This 40-liter bag of brown pebbles is pre-washed for stability and designed to drain freely, ensuring optimal oxygen levels for your plants. Perfect for hydroponics, aquaponics, and decorative uses, these pebbles will not float once wet, providing a reliable foundation for your gardening endeavors.

## Description

GROW!T horticultural clay pebbles are made from 100% natural clay. They are clean, pH stable, and offer great aeration and drainage in hydroponics, especially in flood and drain, deep water culture, and drip feed systems. Due to their unique structure and ability to cover a large surface area, they offer the ideal environment to foster beneficial bacterial growth around the root zone, leading to naturally healthier plants.GROW!T Clay Pebbles can be used for:•Aeration of growing media - ideal to mix into coco coir or soil to aid aeration •Drainage - will hold water as well as offering great aeration properties and free draining •Decoration - looks great as a top dressing for pots and also helps to prevent evaporation •Hydroponics/hydroculture - used widely in hydroponic growing, they are ideal for flood and drain, deep water culture and drip feed systems •Aquaponics - are also ideal to be used in aquaponic systems

Review: Good product - Clean and works well
Review: Good value for starting semi-hydro - Starting my semi-hydro plant journey and bought these. They're not like the perfect orange-y colored balls that you see some people using. These are a regular brown color and are more irregularly shaped, but that's fine for me because I had read it's actually easier to situate your plant in the irregular-shaped leca instead of the perfect balls. For the most part these haven't sunk after soaking them in water (even after soaking for weeks), but I don't think that really matters as far as actually using these for planting because none of the plants I've moved to leca have died and it's been a couple months now.

## Features

- Extremely stable in both pH and EC
- Made from 100% natural clay
- Pre-washed to aid in stability
- Drain freely and do not hold any excess water, providing good oxygen levels around the root
- Will not float once fully wet

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item Weight | 20 Pounds |
| Unit Count | 40.0 Count |
| Item Dimensions D x W x H | 25"D x 5"W x 18"H |
| Size | 40 Liter Bag |
| Item Shape | Rectangular |
| Pattern | Bag |
| Theme | Gardening |
| Color | Brown |
| Style | Classic |
| Product Care Instructions | Hand Wash |
| Fill Material | 100% natural clay pebbles |
| Frame Material | Clay |
| Material Type | Clay |
| Furniture Base Movement | Glide |
| Special Features | Drains freely |

## Product Details

- **Brand:** Hydrofarm
- **Color:** Brown
- **Material:** Clay
- **Product Dimensions:** 25"D x 5"W x 18"H
- **Size:** 40 Liter Bag

## Images

![GROW!T GMC40l - 4mm-16mm Clay Pebbles, Brown, (40 Liter Bag) - Made from 100% Natural Clay, Can be used for Drainage, Decoration, Aquaponics, Hydroponics and Other Gardening Essentials - Image 1](https://m.media-amazon.com/images/I/61FJUW204cL.jpg)
![GROW!T GMC40l - 4mm-16mm Clay Pebbles, Brown, (40 Liter Bag) - Made from 100% Natural Clay, Can be used for Drainage, Decoration, Aquaponics, Hydroponics and Other Gardening Essentials - Image 2](https://m.media-amazon.com/images/I/61iKxhrtfyL.jpg)
![GROW!T GMC40l - 4mm-16mm Clay Pebbles, Brown, (40 Liter Bag) - Made from 100% Natural Clay, Can be used for Drainage, Decoration, Aquaponics, Hydroponics and Other Gardening Essentials - Image 3](https://m.media-amazon.com/images/I/71l5n2JeRfL.jpg)
![GROW!T GMC40l - 4mm-16mm Clay Pebbles, Brown, (40 Liter Bag) - Made from 100% Natural Clay, Can be used for Drainage, Decoration, Aquaponics, Hydroponics and Other Gardening Essentials - Image 4](https://m.media-amazon.com/images/I/71pNwxmNpFL.jpg)
![GROW!T GMC40l - 4mm-16mm Clay Pebbles, Brown, (40 Liter Bag) - Made from 100% Natural Clay, Can be used for Drainage, Decoration, Aquaponics, Hydroponics and Other Gardening Essentials - Image 5](https://m.media-amazon.com/images/I/81a03jtkiiL.jpg)

## Available Options

This product comes in different **Pattern, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good product
*by J***N on November 17, 2025*

Clean and works well

### ⭐⭐⭐⭐⭐ Good value for starting semi-hydro
*by C***C on April 21, 2025*

Starting my semi-hydro plant journey and bought these. They're not like the perfect orange-y colored balls that you see some people using. These are a regular brown color and are more irregularly shaped, but that's fine for me because I had read it's actually easier to situate your plant in the irregular-shaped leca instead of the perfect balls. For the most part these haven't sunk after soaking them in water (even after soaking for weeks), but I don't think that really matters as far as actually using these for planting because none of the plants I've moved to leca have died and it's been a couple months now.

### ⭐⭐⭐⭐⭐ Great product
*by G***Y on November 17, 2025*

Great product

## Frequently Bought Together

- GROW!T GMC40l - 4mm-16mm Clay Pebbles, Brown, (40 Liter Bag) - Made from 100% Natural Clay, Can be used for Drainage, Decoration, Aquaponics, Hydroponics and Other Gardening Essentials
- General Hydroponics pH Control Kit For A Balanced Nutrient Solution

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-01-26*