Limestone Filter Media Stone
Graded crushed limestone (3-6 inch) used as filter media in water treatment plants. Classified HTS 2517.10.00.20 as crushed limestone for concrete or similar aggregate uses. Meets legal definition excluding pebbles while fitting common construction applications.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If prepackaged as complete filter media parts
Parts of water filtering machinery may classify with equipment under 8421.
If for pH adjustment in wastewater
Limestone specifically for chemical neutralization often under flux heading.
If fired into artificial stone articles
Agglomerated or fired limestone products become Chapter 68 articles.
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Import Tips & Compliance
• Water absorption and acid solubility tests required; specify filtration end-use; quarantine periods for invasive species in quarry runoff
Related Products under HTS 2517.10.00.20
Crushed Limestone Aggregate
Crushed limestone pieces typically ranging from 3/8 inch to 1 inch in size, used primarily as concrete aggregate in construction projects. This product falls under HTS 2517.10.00.20 as it is broken or crushed limestone, excluding pebbles and gravel, commonly used for concrete production. It meets the chapter note prioritizing heading 2517 for such stone materials.
Limestone Road Base Material
Crushed and screened limestone (minus 2 inches), used as base material for road construction and paving projects. Classified under HTS 2517.10.00.20 as crushed limestone for road metalling, distinct from natural pebbles or gravel. Chapter notes confirm priority classification in 2517 over other headings.
Limestone Railway Ballast
Hard, crushed limestone rocks sized 1.5-3 inches for use as railway track ballast to provide drainage and stability. This fits HTS 2517.10.00.20 as crushed limestone for railway ballast, excluding gravel forms. Chapter priority rules place it definitively in 2517.
Screened Limestone Chippings
Angular limestone chippings (3/4 inch minus) used in asphalt mixes and landscaping drainage. Under HTS 2517.10.00.20 as processed limestone granules/chippings of heading 2515 stone, not pebbles. Exclusions from other chapters ensure 2517 classification.
Limestone Concrete Riprap
Large crushed limestone boulders (6-18 inches) used for erosion control in concrete structures and waterways. Classified in HTS 2517.10.00.20 as broken/crushed limestone for concrete aggregates or ballast. Chapter note (a) exclusions do not apply to this crude form.
Crushed Limestone Drainage Stone
Clean, crushed limestone (1-2 inches) for French drains and septic systems in construction. HTS 2517.10.00.20 covers this as crushed stone for concrete aggregates or similar uses, excluding gravel. Priority chapter note keeps it from other mineral headings.