Search  for anything...
Hydrofarm

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

  • Based on 4,717 reviews
Condition: New
Checking for product changes
$51.78 Why this price?

Buy Now, Pay Later

As low as $8.63 / mo
  • – 6-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, Jun 22
Order within 9 hours and 28 minutes
Available payment plans shown during checkout

Recently Viewed

Size: 40 Liter Bag


Pattern Name: Bag


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

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

Brand: Hydrofarm


Color: Brown


Product Dimensions: 25"D x 5"W x 18"H


Size: 40 Liter Bag


Special Feature: Drains freely


Brand: Hydrofarm


Color: Brown


Product Dimensions: 25"D x 5"W x 18"H


Size: 40 Liter Bag


Special Feature: Drains freely


Product Care Instructions: Hand Wash


Unit Count: 40.0 Count


Recommended Uses For Product: Gardening


Style: Classic


Pattern: Bag


Room Type: Patio Garden


Age Range (Description): Adult


Included Components: Clay Pebbles


Shape: Rectangular


Model Name: GROW!T GMC40l Clay Pebbles, 4mm-16mm, 40 Liters


Arm Style: Armless


Surface Recommendation: Hard Floor


Furniture base movement: Glide


Indoor/Outdoor Usage: Indoor


Fill Material: 100% natural clay pebbles


Leg Style: Sled Base


Reclining Position Count: 1


UPC: 638104013444


Global Trade Identification Number: 44


Form Factor: Clay Pebbles


Manufacturer: PLANT!T


Item Weight: 20 pounds


Department: Unisex-Adult


Country of Origin: United Kingdom


Item model number: GMC40L


Is Discontinued By Manufacturer: No


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Jun 22

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • The best leca product there is, basically an industry standard
Size: 10 liter Pattern Name: Bag
If you require these, you already know what you need them for. The build quality is excellent. They are simple to setup and easy to use. They do an outstanding job of storing and transporting your water & nutrients. These are the golden standard of leca. Absolutely highly recommended.
Reviewed in the United States on May 26, 2025 by Andy
    • Good value for starting semi-hydro
Size: 40 Liter Bag Pattern Name: Bag
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. ... show more
Reviewed in the United States on April 21, 2025 by CC
    • Honest Reviews
Size: 10 liter Pattern Name: Bag
Even though I never really used it in my aquaponics system, I would still recommend it, because it's lightweight and it provides the roots of the plants and vegetables plently of oxygen.
Reviewed in the United States on March 1, 2025 by Vahe Kashiktchian
    • Volume and Weight included.
Size: 40 Liter Bag Pattern Name: Bag
Review Image by Franky Franky
Review Image by Franky Franky
Box size is 24" x 16" x 6". The bag weights 21.94 lbs of material. The granular media is highly irregular.
Reviewed in the United States on March 8, 2025 by Franky Franky
    • The most for your $
Size: 40 Liter Bag Pattern Name: Bag
Review Image by Brian Brian
Review Image by Brian Brian
Review Image by Brian Brian
I normally buy leca in bulk but needed some ASAP so I ordered this bag. I didn't expect this bag to be huge but it is. I'd say there's 20 lbs of lecca in here at least! Definitely worth the $ I paid! Happy growing!
Reviewed in the United States on January 4, 2025 by Brian Brian
    • bought twice
Size: 10 liter Pattern Name: Bag
It worked enough for a second purchase. I washedf the crap pout of them and still dusty. So wash them....
Reviewed in the United States on February 9, 2025 by Toby
    • All good
Size: 40 Liter Bag Pattern Name: Bag
Perfect
Reviewed in the United States on January 25, 2025 by Shawn
    • 10 liters is quite a bit - good pebbles
Size: 10 liter Pattern Name: Bag
Review Image by Shannyn Shannyn
Review Image by Shannyn Shannyn
Review Image by Shannyn Shannyn
Review Image by Shannyn Shannyn
Review Image by Shannyn Shannyn
If you are looking for perfectly round pebbles, like on the photo on the bag, look elsewhere. I read the reviews, so I was aware of what I was getting. Most of the pebbles were irregular shaped and looked like odd lava rock, but that does not affect my hydroponics system. I use a combination of hydroton in the bottom of each tier of the system and then in the grow baskets surrounding my roots. I used to grow directly in the tiers, in perlite, but I have always enjoyed hydroton, and this way I also have more control over the root system so that it does not clog my system. I just ordered a 40 ltr bag because 10 ltrs was only enough to make a short foundation in each of the tiers of one system. Since I completely switched over from Perlite this year, I need a lot. I soaked first (see picture of pebbles in the pink tub) and then I drained and strained. Towards the bottom, I strained and rinsed again in the strainer. A lot of mud and residue comes off of these, so be sure to soak and rinse before adding it to your systems. Obviously, I will check pH once I get everything set up for the plants, as I know that having this much hydroton will likely change the water balance, but that is okay. I also used this same brand in an aquaponics system, and I grew strawberries, mint and chamomile successfully. The hydroton did not bother the fish. ... show more
Reviewed in the United States on May 6, 2017 by Shannyn Shannyn

Can't find a product?

Find it on Amazon first, then paste the link below.