Professional products Raw materials Pumice
Italian pumice for drainage in custom mixes and Pro substrates.
Arber Pumice is an inert raw material of natural Italian volcanic origin, sourced from a consolidated supply chain. Available in two granulometries — 3–8 mm in 50 L Bag and Big Bale, 3–5 mm in Big Bale — for custom mix formulation and integration into Pro substrates for medium- to long-cycle plants.
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Features
Pumice is a porous, lightweight volcanic rock. Arber Pumice provides high drainage capacity and root oxygenation while maintaining chemical inertness over the medium and long term. Available in two granulometries — 3–8 mm for medium-to-coarse repotting mixes and long-cycle substrates (main structural component of Arber volcanic-based substrates), and 3–5 mm for mixes calibrated for rapid drainage.
Added at calibrated rates to peat-based substrates, pumice maintains drainage and oxygenation even after many months on the bench. This is a specific requirement for long-cycle container plants and species sensitive to waterlogging. Italian pumice from a consolidated supply chain: consistently from the same extraction basin, season after season, to ensure batch-to-batch quality continuity. 30 years of selected supply chain and 7 million m³ of substrates produced since 1996.
Why choose it
- Italian pumice, classified 3–8 mm, stable mineral material over time.
- Stable structure for 3+ years: no biological degradation, no structural collapse in the container.
- Neutral pH and air capacity >40%: does not alter the substrate profile.
- Structural backbone for long-cycle outdoor container plants.
- Available in 50 L Bag and Big Bale for nursery volumes.
Why use it
Structural backbone of mixes
Stable mineral material over time: the physical structure remains constant throughout the plant cycle.
Consistent drainage and oxygenation
High air capacity and porosity: rapid drainage in large pots and long-cycle outdoor containers.
Chemically inert, does not alter the profile
Neutral pH and stable mineral composition: no interference with fertilisation or mix additives.
Granulometries for every application
3–8 mm for medium-to-coarse repotting, 6–14 mm for outdoor ornamentals and in-ground landscaping.
Technical specifications
| Product category | Volcanic mineral raw material |
| Raw material type | Pumice |
| Available particle sizes | 3–8 mm |
| Origin | Italy |
| Production method | Extraction and granulometric grading |
| Water retention capacity | Moderate |
| Air capacity | High — porous and free-draining structure |
| pH range (as is) | Neutral |
| Conductivity (EC) | Low |
| Bulk density | Medium · stable mineral material |
| Compatibility | Universal · structural backbone for long-cycle substrates |
Available formats
| Format | Units / pallet |
|---|---|
50 L | 36 |
 Big Bale | 1 |
Arber professional raw materials
View all Arber substrates for this crop type, with selection criteria and technical comparison.
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