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  Expanded Shale Grow Media - Bulk Orders
Expanded Shale Grow Media - Bulk Orders

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Product Code: CWHBB004



Expanded Shale Grow Media - Bulk Orders

For bulk orders of 10 bags (500 liters) or more contact
for volume discount pricing.

(This product is available only in the U.S.)

Depending on the amount you want we can ship by the truckload (36 cubic yards) or by the pallet using 25 liter sacks.

What is Expanded Shale? 
Expanded Shale is a lightweight aggregate that is an ideal growing media in hydroponic or aquaponic systems. The shale is mined, crushed and fired under high temperatures in a rotary kiln, producing a clean, inert, porous, and light material. Because of the large amount of cracks and fissures in the expanded, the media can retain a large amount of moisture which can reduce the amount of flooding cycles needed for flood & drain (ebb & flow) systems. 

For aquaponic systems, there is a large amount of surface area per stone for producing beneficial bacteria for converting ammonia into nitrates. Expanded shale has been used for nearly 100 years primarily as a building material. It is added to concrete to make lighter buildings and bridges since it is half the weight of standard crushed stone. The aggregate is also used as an additive in clay soils to increase its drainage properties as well as a decorative mulch around buildings and gardens. 

Shipped in a double walled box with two inner bag liners to prevent spilling.

Product Comparison 
There are several types of media that could be used in a hydroponic/aquaponic system. This table displays some of the pro's and con's for each option:

 Expanded ShaleExpanded Clay
River StoneCrushed StoneSynthetic
WeightSlightly heavier than expanded clay1/2 the weight of stoneHeavy!Heavy!Lightest - tends to float
EnviromentalMined from a quarryMined from a quarryMined near local rivers.  Larger environmental impact than engineered quarriesMined from quarry or consists of crushed river stoneMade from petroleum
OriginUnited StatesTypically imported from Germany or ChinaLocal quarryLocal quarryTypically imported from China
ph Neutral (inert)YesYesTake a chance.  If the stone has any limestone, it will continue to raise the pHSame problem as River StoneYes
Easy on the hands?Yes - even though the shale has been crushed, the kiln process rounds over all the edgesYes - though the spheres tends to roll away when dropped!YesTypically very sharp and hard to dig in with bare handsYes
(1=cheapest - 5=most expensive)

Average Customer Review: 5 of 5 | Total Reviews: 1 Write a review.

  1 of 1 people found the following review helpful:
Worms and Seeds like it too May 3, 2011
Reviewer: Rick Op from Houston, TX United States  
I ordered Expanded Shale when setting up my first growbed (300 gallons and two feet deep). I will continue to use Expanded Shale since I see my worms are thriving in it. It wicks water up a couple of extra inches above your high-water line and holds moisture for hours. Okra, eggplant, tomato, grapevine, corn all doing well. Sterile and therefore VERY GOOD for seed starting if you keep it moist until the root taps down a little bit.

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