- 216 x Cultiwool 4" x 4" x 2.5" Rockwool Growing Blocks
Cultiwool 4" x 4" x 2.5" Growing Blocks (216 Blocks/Case)
starting from 0% interest financing from
/mo.
- 216 blocks per case with 38mm or 40mm pre-cut plug holes
- Donut ring centers drippers and creates a water chamber for even distribution
- 4 inch footprint fits standard flood trays and automated irrigation benches
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Commercial & Bulk Purchasing
We support operations & licensed facilities with volume pricing, dedicated account managers, and custom equipment consultation.
Who This Is For
- You are standardizing your irrigation cycles because inconsistent water distribution is creating uneven plant growth.
- You are prioritizing root health because blocks sitting flat on the tray keep moisture trapped and invite pathogens.
What We Found
- The donut ring creates a small reservoir that prevents water from just running off the sides of the block
- Those bottom grooves are deeper than most, which keeps air moving and prevents slime buildup underneath
- The foil wrap is thick enough that it does not tear easily when you are sliding blocks across a wire rack
What Users Say
- Growers who switched from unwrapped blocks say they finally stopped scraping algae off the top of their media
- Users running automated dripper stakes say the donut ring design keeps their irrigation lines much more stable
- Facilities moving to these blocks report healthier root zones because the drainage grooves prevent waterlogging
Cultiwool 4" x 4" x 2.5" Growing Blocks (216 Blocks/Case)
Struggling with inconsistent moisture and root diseases in your hydroponic setup? The Cultiwool 4" x 4" x 2.5" Rockwool Blocks provide the professional-grade solution for uniform water distribution and superior drainage. These premium stonewool blocks are designed for growers who demand reliable propagation media with advanced water management. Each 100mm x 100mm x 65mm block utilizes rapid absorption technology to eliminate dry spots and waterlogging. If you require larger volumes for later stages, consider the Cultiwool 4 x 4 x 4 blocks for expanded root capacity.
What's Included
Features
🍩
Donut Ring Tech
Industry-first water chamber ensures perfect dripper placement and homogeneous water distribution throughout the block.
💧
Drainage System
Bottom grooves improve water flow and reduce ground contact, minimizing disease risk from root pathogens.
🛡️
Algae Prevention
Black/white foil wrapping prevents algae growth while maintaining optimal light management for healthy development.
⭐
Premium Quality
High-quality European stonewool provides consistent texture and reliable water retention for professional results.
Specifications
| Specification | Value |
|---|---|
| Material | Premium Stonewool |
| Dimensions | 4" x 4" x 2.5" (100mm x 100mm x 65mm) |
| Plug Hole Size | 38mm / 40mm |
| Quantity per Case | 216 Blocks |
| Special Features | Donut Ring, Drainage Grooves, Black/White Foil |
| Selling Unit | Case Only |
FAQs
What is Donut Ring technology?
It is a specialized water chamber design on the top of the block that ensures precise dripper placement and uniform water distribution throughout the entire substrate.
Can I use these with Cultiwool rooting plugs?
Yes, these blocks feature a 38mm/40mm hole designed to fit Cultiwool round macro plugs or similar propagation media perfectly.
How does the foil wrapping benefit my plants?
The black/white foil prevents algae growth on the surface of the rockwool while reflecting light back toward the plant canopy, optimizing growth conditions.
What are the drainage grooves for?
The cross grooves at the bottom improve airflow and drainage, reducing the risk of root-borne pathogens by minimizing direct contact with the growing surface.
Is this product suitable for commercial hydroponics?
Absolutely. Cultiwool is high-quality European stonewool trusted by professional growers worldwide for its consistency and performance.
Happy To Help
Questions About This Product?
Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)
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