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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 4,722 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Esbenshades Garden Center
Arrives Sunday, Aug 10
Order within 23 hours and 13 minutes
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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


Tilting: No


Is Customizable: No


Is Foldable: No


UPC: 638104013444


Global Trade Identification Number: 44


Form Factor: Clay Pebbles


Manufacturer: PLANT!T


Item Weight: 20 pounds


Department: Unisex-Adult


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, Aug 10

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.

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  • Financing through Apple Pay
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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
    • perfect item
Size: 40 Liter Bag Pattern Name: Bag
arrived quick and item was perfect. thanks
Reviewed in the United States on July 21, 2025 by Ahhh
    • 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
    • Recommended
Size: 40 Liter Bag Pattern Name: Bag
This growth medium is great for hydro-gardens. I have been using this product for about a year and this is not my first bag, I have ordered from Amazon and bought locally, no difference at all, cost & function are the same.. My first thoughts were that the roots would get smashed with this medium in the Drip Method because it floats in water then sinks down when drained but that was not the case at all, in fact, my root systems were so healthy that they actually ate the medium up so do not expect to reuse for another crop, you will be lucky to find it within the massive root structure. Needless to say, the end result was amazing and I have never seen roots like that before... huge, pure white, and massive in length.. it was something you just don't see with a soil medium. End results were much healthier roots & stalk and a better tasting, yielding & healthier harvest. No disease or pests to battle since most originate or breed in soil. This is the way to go. 4 stars! *If this review helped you either way, could you please leave me a Helpful to let me know? Thanks!* ... show more
Reviewed in the United States on June 9, 2020 by LifePathin4D
    • 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
    • Worked great in my 55gal flood and drain system
Size: 40 Liter Bag Pattern Name: Bag
Review Image by John John
I bought these for my flood and drain set-up. You have to clean these very well as they have a lot of powder from production. As I was cleaning I was worried because they all floated. I made sure all of the water was out of my barrels and filled to the top with rock. I then flooded them and I was very happy because the weight of the pebbles where enough to keep from floating up and over the sides. There is also maybe an inch of dry rock at the top of my system to prevent the growth of alge. They are perfect for my halfbarrel flood and drain. Also if your interested took just about 6 to fill 2 half barrels. Its a lot of money but after digging out my $150 of rock that tested fine with vineger but then the ph started creeping up was not fun either. This pebble is so light and easy on the hands to work with and should withstand for so long I'm happy with the investment. ... show more
Reviewed in the United States on August 4, 2018 by John John
    • 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
    • Bad Quality
Size: 40 Liter Bag Pattern Name: Bag
I built an aquaponics system for my daughter and filled the grow bed with two bags of this media. The media was extremely dirty and ended up clogging my laundry sink. I’ve never had anything clog my laundry sink before but the excess clay dust from this media did it. Despite soaking the pieces for a week, they still float. Most of the pieces are broken and there are a lot of really small pieces, the size of gravel that can wash down into the fish tank and cause issues with your pump. After figuring out that they don’t stay in place and float, I ended up getting pond rock from Lowes and using that to fill up half of the grow bed. I then used 1 bag of this media to complete the grow bed. This was a lot cheaper and worked a lot better. If I had to guess, I believe this is seconds or perhaps defects that are sold as firsts and for the price, that makes sense. I found much better media from another vendor. The biggest difference is the legit clay sounds like rice crispy cereal when they get wet from all the pores soaking up water. These definitely do not do this. They are more like lava rock or something weird. ... show more
Reviewed in the United States on January 30, 2022 by Gotta_Clue

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