Shop
  • Deals
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.
TermsPrivacy
BrowseBrowse deal.ai
Deal.ai › Grodan
Grodan
Grodan Rockwool Grow Chunks 2 Cubic Feet, Case of 3 Bags

Grodan Rockwool Grow Chunks 2 Cubic Feet, Case of 3 Bags

4.7(6 ratings)

Last price we saw

$125.70at HTG Supply, last seen Nov 7

Prices change often: ask the agent below to check today's price at every store.

Prices are checked against each store and labelled with when.

Check today's price at HTG Supply

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

Our take on the Grodan Rockwool Grow Chunks 2 Cubic Feet, Case of 3 Bags

Grodan Rockwool Grow Chunks are 1/4-inch rockwool pieces used as a soil amendment to loosen potting mixes and hold moisture. This case holds three 2-cubic-foot bags, about 6 cubic feet total, weighing roughly 24 lb. They suit container gardening and hydro systems where roots need air as well as water. Rockwool chunks are a niche item, so pricing varies widely by seller and pack size; compare the per-cubic-foot cost across stores before buying a case.

Best forContainer and pot growers mixing their own mediaHydroponic setups needing a stable, airy substrateGrowers amending dense peat or coco mixesAnyone who wants better moisture retention without compaction
Pros
  • Holds moisture while keeping air around roots
  • Chunky 1/4-inch form resists compaction better than fine rockwool
  • Reusable after cleaning in many hydro setups
  • Neutral pH and no nutrients, so you control feeding
  • Case of three 2-cubic-foot bags covers a lot of pots
Cons
  • Rockwool dust irritates skin and lungs; wear a mask and gloves
  • Chunks can float or shift in flood-and-drain systems
  • Not a standalone soil; needs mixing or a nutrient program
  • Bags are bulky and heavy to store
  • Loose fibers are hard to clean up

Grodan Rockwool Grow Chunks 2 Cubic Feet, Case of 3 Bags prices at every store

  • eBayCheck price at eBay
  • HTG SupplyCheck price at HTG Supply

Store links may earn us a commission.

Grodan Rockwool Grow Chunks 2 Cubic Feet, Case of 3 Bags price history

Lowest price we've seen: $125.70 on Nov 7 at HTG Supply. Tracked across 1 store since Nov 7.

What reviewers say

Growers who use rockwool chunks value the aeration and moisture balance in containers and hydro beds. Common complaints are dust when handling dry chunks and chunks floating or migrating in active systems.

What people mention
  • AerationPraisedGrowers say the chunks open up dense mixes and keep roots from staying soggy.
  • MoisturePraisedOwners report the chunks hold water well between feedings.
  • DustCriticisedHandling dry chunks produces irritating dust that calls for a mask.
  • FloatingMixedSome hydro users find chunks float or shift in flood-and-drain systems.
  • DurabilityPraisedChunks break down more slowly than fine rockwool over a grow cycle.

Specifications

Primary Use
Soil amendment (for added aeration and increased moisture-holding properties)
Type
Soil, Media
Form
Chunks
Size
1/4"
Item Weight
24.0 lb
Dimensions
4 x 4 x 4
Effect Highlights
Increased moisture-holding properties, Added aeration

Questions and answers

Can I use these chunks alone as a growing medium?
Yes, in hydroponic systems with a nutrient solution, but they hold little nutrition on their own. Most growers mix them into soil or coco or run them in a hydro setup with regular feeding.
How much media does a case cover?
Three 2-cubic-foot bags give about 6 cubic feet of chunks. That fills roughly six 10-gallon pots or a larger number of smaller containers, depending on how much you blend in.
Are rockwool chunks safe to handle?
The fibers can irritate skin, eyes and lungs. Wear gloves and a dust mask when opening bags or mixing dry chunks, and dampen them first to cut dust.
Do I need to pH-adjust rockwool before use?
Rockwool is near neutral but often slightly alkaline when new. Many growers soak or rinse chunks and set nutrient pH to about 5.5 to 6.0 for hydro use.
Can I reuse the chunks?
Yes, many growers rinse and sterilize chunks between cycles. Remove root debris and treat them before reuse to limit disease carryover.
What do buyers say about the Grodan Rockwool Grow Chunks 2 Cubic Feet, Case of 3 Bags?
Rated 4.7 out of 5 from 6 ratings.
Where can I buy the Grodan Rockwool Grow Chunks 2 Cubic Feet, Case of 3 Bags?
2 stores we checked sell it, including eBay, HTG Supply.
Included Materials
Soil, Clay pellets, Coco fiber
Suitable Application Site
Pots, Container gardening, Hydro systems