Solving drainage in large pots, replacing gravel in lightweight concrete, or creating a permanent growing medium for hydroponics requires a lightweight ceramic aggregate with calibrated porosity. This arlite—also called expanded clay, LECA, or clay balls—is supplied by Gardese in a 40 L bag with 8-16 mm granulation, designed for professional gardening, hydroponics with recirculating systems, decorative landscaping, and lightweight construction projects where indefinite durability and thermal insulation are critical.
Key Benefits
- Superior drainage with modulated retention: Internal porosity retains moisture but the space between the balls ensures complete drainage, preventing waterlogging and root rot in deep pots.
- Significant structural lightness: Low specific gravity dramatically reduces dead load in tall planters, raised garden beds, and concrete mixes for roofs.
- Thermal and acoustic insulation: The closed cellular structure traps air, improving energy efficiency in roofs, floors, and cavity fillings.
- Indefinite and inert durability: High-temperature ceramic that does not degrade, compact, or rot, is fire and frost-resistant, with a stable neutral pH.
- Controlled Gardese origin: Calibrated ceramic by granulometry and processing that minimizes residual dust, producing a homogeneous material in weight and porosity.
Typical applications and uses
- Drainage base in pots, planters, and green roofs to prevent root rot.
- Permanent growing medium in hydroponics with recirculating systems, NFT, and aquaponics.
- Surface decoration (mulching) in gardening to reduce evaporation and provide a professional finish.
- Lightweight concrete, screed overlays, and leveling fills between beams in construction.
Quality and durability
An inexpensive arlite fails in two points: the granulometric calibration is irregular (which alters drainage behavior) and the thermal processing is inconsistent (which produces balls with variable hardness that break when handled). Gardese works with calibrated expanded clay and controlled firing that ensures uniform hardness, which separates a professional hydroponic or serious construction aggregate from a generic bag that crumbles during use.
No. It is a chemically inert material with a stable neutral pH, meaning it does not release ions that change the acidity of irrigation water, the nutrient solution in hydroponics or the substrate mix. This makes it safe for any crop, from cacti requiring alkaline pH to hydrangeas that prefer acidic pH. It also does not react with cement or construction admixtures, keeping the chemistry of the concrete it is mixed into stable.
Yes — that's one of its big advantages over organic substrates. After a crop cycle it's removed, separated from roots and organic matter, washed with water and disinfected (rinse with diluted hydrogen peroxide, oxygenated water, or dry heat). High-temperature ceramic does not degrade with washing or lose drainage properties, which lets you reuse it for years in professional hydroponic systems.
It works for both uses and is a dual-purpose material. In gardening it works as a drainage base, hydroponic medium and decorative mulching. In construction it is an aggregate for lightweight concrete: it replaces conventional gravel to reduce dead load on roofs, floor leveling layers and grade fills, providing thermal insulation that ordinary gravel does not offer. For flat roofs where reducing structural load matters, it is the standard technical option.
The difference is in four points. Weight: expanded clay weighs significantly less than regular gravel — critical in large pots. Insulation: internal air pockets that insulate roots from sudden temperature swings. Reuse: expanded clay can be washed and reused; gravel gets contaminated with organic matter. Aesthetics: expanded clay offers a uniform decorative finish. For small pots, gravel does the job; in professional use, expanded clay justifies the switch.
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| Grain size | 8-16 mm (0.3-0.6 in) |
|---|---|
| pH level | Neutral (~7.0) |
| Drainage capacity | High |
| Base material | Thermally expanded natural clay |
| Sack: Width | 48.0 cm (18.9 in) |
|---|---|
| Sack: Height | 21.0 cm (8.27 in) |
| Sack: Depth | 88.0 cm (34.65 in) |
| Sack: Weight | 11.0 kg |
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