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Drainage / Subsoil Materials
- Product Description :
- Drainage / Subsoil Materials are uniformly graded (20-40mm), washed stones with <5% fines content. Designed for high permeability (>10⁻² cm/s), they are used in French drains, septic fields, and retaining wall backfill. Typically granite or limestone meeting ASTM D448 size specifications.
- Standard :
- Geospec 3 (CEDD)
- Grading :
