Q: Why anthracite filter media instead of just sand?

Anthracite's lower density (0.7 g/cm³ vs 2.65 g/cm³ for sand) keeps it on top during back-wash bed-fluidization stratification, creating depth filtration. Its larger particle size (1.0–2.5 mm vs 0.5–0.8 mm for sand) catches large flocs without rapid head-loss buildup, extending filter-run length. A single-media sand filter has fines moving to the top during back-wash and coarse to the bottom — exactly the opposite of what depth filtration needs. The first cm of sand surface clogs immediately, head loss builds rapidly, filter run is short (8–12 hours), and back-wash frequency is high. Adding an anthracite top layer reverses the surface gradient: large flocs are caught throughout the 60 cm anthracite depth (not just the top 1 cm of sand), filter run extends to 24–72 hours, and back-wash water demand drops by 30–50%. The anthracite + sand combination is now the AWWA standard for municipal drinking water treatment. Anthracite specification: hardness ≥7 Mohs (resists attrition during back-wash), low ash (≤8%), bulk density 0.7–0.9 g/cm³.

Q: When should I use diatomite filter aid?

Use diatomite filter aid (DE / Celite-equivalent) when filtering low-solids high-clarity liquids — beer/wine/fruit-juice clarification, pharmaceutical and chemical filtration, swimming pool finish-polish. Pre-coat at 0.5–1.5 kg/m² on a leaf or plate filter, then body-feed during continuous operation to maintain permeability. Diatomite is fossilized diatom skeletal silica (typically 85–95% SiO₂) calcined at 1000°C or flux-calcined with sodium salt at 1100°C to give characteristic intricate pore-structure (90% porosity, particle 5–50 μm). It works as a depth filter aid — the pre-coat creates a cake that physically traps suspended solids without clogging. Body feed (continuous addition during filtration) maintains cake permeability as solids accumulate. The endpoint is rising filter pressure differential; the spent cake is dumped and re-coated. Imerys Celite 545 (calcined) and Celite 503 (flux-calcined) are the global benchmarks. Food-grade diatomite must have ≤1% crystalline silica (cristobalite, which is a Class 1 carcinogen) per FDA / EU GRAS / Codex Alimentarius. Beer brewers use 100–500 g DE per hectoliter; sugar refineries use 500–1500 g per tonne sugar.

Q: How does gold-mining grade activated carbon differ from water-treatment grade?

Gold-mining grade is coconut-shell-based with hardness ≥98% and mesh 6×12 (larger particles), engineered to survive multiple cycles through pump-impellers and elution columns in CIP (carbon-in-pulp) or CIL (carbon-in-leach) circuits without attrition. Water-treatment GAC at 92–95% hardness disintegrates after 5–10 cycles. In gold CIP/CIL processing, the activated carbon adsorbs gold cyanide complex (Au(CN)₂⁻) from a leach slurry, gets pumped to an elution tank where hot caustic strips the gold for downstream electro-winning, then the carbon is acid-washed and thermally reactivated, and cycled back. A single carbon batch goes through 50–100 cycles over 6–18 months service life. Mechanical hardness is everything — soft carbon attrites into the slurry, lost as a fines fraction. Coconut-shell GAC has hardness 98–99% (ASTM D3802-79 ball-pan abrasion test) while bituminous-coal GAC is 92–95%. Standard mining-grade specs: hardness ≥98%, mesh 6×12 (1.7–3.4 mm), iodine ≥1100 mg/g, ash ≤3%, moisture ≤5%. Calgon SR-Plus, Haycarb GoldStream, and Norit ROW Gold are global benchmarks; Chinese coconut-shell GAC from Fujian and Hainan has gained market share.

Q: Is filter media regenerable? When does it pay vs replacement?

GAC is regenerable through 3–5 thermal reactivation cycles (800°C in steam, 5–15% mass loss per cycle); anthracite and quartz sand are not regenerable but last 5–10 years before replacement. Spent activated alumina is regenerable through 100+ cycles. Spent diatomite is single-use. Thermal reactivation of spent GAC happens at a centralized facility (Calgon Carbon, Cabot, Jacobi, ResinTech operate North American regen plants; Chinese regen is centralized in 河北、宁夏、山西) — the carbon is fired at 800°C in steam atmosphere to volatilize adsorbed organics and re-open pore structure. Each cycle loses 5–15% of the original capacity through structural collapse; after 3–5 cycles the carbon is too friable for further use and is disposed as non-hazardous waste (the volatilized organics are oxidized in the reactivation kiln afterburner). Economics: virgin GAC costs $1.5–3.0/kg; reactivation at $0.7–1.2/kg makes sense when transport to the regen facility is reasonable (< 500 km). Anthracite and quartz sand don't reactivate — they don't absorb anything chemically, they just depth-filter. They get replaced when accumulated micro-particles permanently block bed permeability (typically 5–10 years).

Q: What is NSF/ANSI 61 certification and why does it matter?

NSF/ANSI 61 is the North American standard for drinking-water system components — verifying that the material does not leach toxic substances (lead, arsenic, BTEX, etc.) into the treated water at levels above EPA / WHO drinking-water limits. Required by most US/Canadian municipalities, recommended for EU and APAC drinking-water specs. Testing protocol: install the activated carbon (or filter media) in a typical filter configuration, treat NSF-spec model water for 30 days at 50°C, measure leachate concentrations for ~30 regulated parameters. Pass threshold is < 10% of the EPA drinking-water MCL for each parameter. NSF certified products carry the NSF mark and certificate number — required by US drinking-water purchase orders, Canadian Health Canada drinking water specs, and increasingly required in EU drinking-water tenders. Chinese-origin GAC and anthracite have been increasingly NSF-certified through 2018–2025 (initial NSF certification cost is $30k–60k for the manufacturer plus annual fees). For non-drinking-water applications (industrial wastewater, mining, gas filtration), NSF/ANSI 61 is not required and the standard COA / RoHS / REACH chemical-purity testing suffices.

Q: How do Chinese activated carbon prices compare to Calgon, Cabot, Jacobi?

Chinese-origin GAC and anthracite are typically 40–60% lower CIF than equivalent international brand grades, with the gap widest on commodity water-treatment GAC and narrowing for NSF-certified drinking-water grades and high-spec mining-grade coconut-shell carbon. Commodity coal-based GAC (iodine 1000 mg/g, mesh 8×30) prices roughly $1.0–1.8/kg CIF from a Tier-1 Chinese producer (宁夏华辉, 山西新华化工, 河南巩义集群) vs Calgon F400 or Cabot Norit ROW at $2.5–3.5/kg. Quality has converged since 2018 — Chinese producers now operate continuous rotary-kiln activation furnaces and gel-grade quality control matching Western specs. For NSF/ANSI 61 certified drinking-water grades, the gap narrows to 20–30% ($2.0–2.5/kg Chinese vs $3.0–3.5/kg Western). For gold-mining coconut-shell GAC (hardness ≥98%, iodine ≥1100, mesh 6×12), the gap narrows further to 15–25% because only 2–3 Chinese producers are qualified (福建源升, 山东元拓 mainly). For specialty CO₂ capture or PFAS sorbent grades, Western brands retain technology leadership.

Question 1

GAC (Granular) vs PAC (Powdered) activated carbon — which should I use?

Accepted Answer

Use GAC for continuous fixed-bed contact (drinking-water filtration, industrial column adsorption) where bed depth and back-wash matters. Use PAC for batch contact + filtration (sugar decolorizing, drinking water emergency taste/odor control, spot-treatment) where the contact time is short and disposal is single-use. GAC mesh size (typically 8×30 = 0.6–2.4 mm) is engineered for low pressure drop in deep beds. Empty-bed contact time (EBCT) of 8–15 minutes at superficial velocity 5–15 m/h is standard for drinking water; the bed runs for 1–3 years before regeneration (thermal reactivation at 800°C). PAC particle size (typically 200–325 mesh = 45–75 μm) gives 5–10× faster adsorption kinetics — ideal when contact time is 30–60 minutes max (mixing tank), but the powder is hard to recover and is typically used once. Cost comparison: PAC at $1.0–2.0/kg vs GAC at $1.5–3.0/kg sounds favorable but factor in regeneration economics — over a 10-year life, a GAC bed regenerated 3 times costs $4–6/kg cumulative vs PAC at $1.5/kg per use, but PAC needs to be re-dosed every batch. Net cost-effectiveness depends on water-quality target and treatment volume.

Question 2

What does the iodine number mean and what number do I need?

Accepted Answer

Iodine number measures the activated carbon's capacity to adsorb iodine from solution, in mg I₂ per gram of carbon. It correlates with micropore volume (10–20 Å pores) and is the standard screening parameter for activated carbon performance. Most drinking-water specs require ≥900 mg/g; high-end gold-mining and pharmaceutical specs require ≥1100 mg/g. ASTM D4607-94 specifies the test method: contact 1 g of activated carbon with 100 mL of standardized iodine solution, measure residual iodine after filtration. Higher iodine number means more micropores and higher capacity for small molecules (chlorine, taste/odor compounds, low-MW organics). Iodine number is NOT predictive for large-molecule adsorption (humic acids, color compounds) — for those use the methylene-blue number (MBN, indicates meso-pore volume) or molasses number. Coal-based GAC typically delivers iodine 900–1100 mg/g; coconut-shell carbon goes higher (1050–1300 mg/g) and is preferred for gold mining. Wood-based carbon for sugar decolorizing prioritizes meso-porosity over iodine.

Question 3

Coal-based vs coconut-shell activated carbon — when does each matter?

Accepted Answer

Coal-based for water treatment, industrial gas adsorption, and general organic removal (cost-effective baseline). Coconut-shell for gold mining (hardness matters), pharmaceutical / electronic-grade (low ash, low metals), and food/beverage (taste-neutral). Wood-based for sugar decolorizing and dye removal (large meso-pores). Coal-based GAC has higher micropore volume (60–80% of total pore volume) and is the lowest-cost option per kg of adsorption capacity. Bituminous-coal GAC dominates the water-treatment market. Coconut-shell GAC has higher mechanical hardness (96–99% vs 92–95% for coal) — essential for gold-mining columns where the carbon cycles through pump-impellers and elution columns 50+ times without attrition loss. It also has lower ash (typically 2–5% vs 8–15% for coal) — critical for pharmaceutical, food, and electronic-grade applications where ash leaches metals into the product. Wood-based carbon (steam-activated wood charcoal) has a wider pore-size distribution and 30–40% meso-pore volume — preferred for adsorbing larger molecules in sugar-cane juice clarification, fruit-juice decolorizing, and dye-house wastewater.

Question 4

How do I design a multi-media filter bed?

Accepted Answer

Standard 3-media drinking water filter: 60 cm anthracite (1.0–1.5 mm) top + 30 cm quartz sand (0.5–0.8 mm) middle + 15 cm garnet (0.3 mm) bottom. Filtration rate 5–10 m/h, back-wash every 24–72 hours. Effective filtration size 0.45–1.5 mm; uniformity coefficient < 1.6. Bed-fluidization back-wash stratification keeps anthracite on top (density 0.7 g/cm³) and garnet at bottom (density 4.0 g/cm³) — the density gradient is what allows the multi-media bed to depth-filter (coarse top catches large flocs, fine bottom polishes). Back-wash velocity 25–40 m/h (10–25% bed expansion) for 5–10 minutes is typical. Filter run length is measured by head loss (replace media when ΔP exceeds 1.5–2.5 m water column) or breakthrough (residual turbidity above 0.3 NTU). Anthracite + sand + garnet is the AWWA-standard 3-media design; AWWA-standard 2-media is anthracite + sand only. For high-iron or manganese water, replace garnet bottom layer with green-sand (KMnO₄-coated zeolite) or pyrolusite ore. EBCT 5–15 min is typical for surface water; ground water can run shorter EBCT 3–8 min.

Question 5

Why anthracite filter media instead of just sand?

Accepted Answer

Anthracite's lower density (0.7 g/cm³ vs 2.65 g/cm³ for sand) keeps it on top during back-wash bed-fluidization stratification, creating depth filtration. Its larger particle size (1.0–2.5 mm vs 0.5–0.8 mm for sand) catches large flocs without rapid head-loss buildup, extending filter-run length. A single-media sand filter has fines moving to the top during back-wash and coarse to the bottom — exactly the opposite of what depth filtration needs. The first cm of sand surface clogs immediately, head loss builds rapidly, filter run is short (8–12 hours), and back-wash frequency is high. Adding an anthracite top layer reverses the surface gradient: large flocs are caught throughout the 60 cm anthracite depth (not just the top 1 cm of sand), filter run extends to 24–72 hours, and back-wash water demand drops by 30–50%. The anthracite + sand combination is now the AWWA standard for municipal drinking water treatment. Anthracite specification: hardness ≥7 Mohs (resists attrition during back-wash), low ash (≤8%), bulk density 0.7–0.9 g/cm³.

Question 6

When should I use diatomite filter aid?

Accepted Answer

Use diatomite filter aid (DE / Celite-equivalent) when filtering low-solids high-clarity liquids — beer/wine/fruit-juice clarification, pharmaceutical and chemical filtration, swimming pool finish-polish. Pre-coat at 0.5–1.5 kg/m² on a leaf or plate filter, then body-feed during continuous operation to maintain permeability. Diatomite is fossilized diatom skeletal silica (typically 85–95% SiO₂) calcined at 1000°C or flux-calcined with sodium salt at 1100°C to give characteristic intricate pore-structure (90% porosity, particle 5–50 μm). It works as a depth filter aid — the pre-coat creates a cake that physically traps suspended solids without clogging. Body feed (continuous addition during filtration) maintains cake permeability as solids accumulate. The endpoint is rising filter pressure differential; the spent cake is dumped and re-coated. Imerys Celite 545 (calcined) and Celite 503 (flux-calcined) are the global benchmarks. Food-grade diatomite must have ≤1% crystalline silica (cristobalite, which is a Class 1 carcinogen) per FDA / EU GRAS / Codex Alimentarius. Beer brewers use 100–500 g DE per hectoliter; sugar refineries use 500–1500 g per tonne sugar.

Question 7

How does gold-mining grade activated carbon differ from water-treatment grade?

Accepted Answer

Gold-mining grade is coconut-shell-based with hardness ≥98% and mesh 6×12 (larger particles), engineered to survive multiple cycles through pump-impellers and elution columns in CIP (carbon-in-pulp) or CIL (carbon-in-leach) circuits without attrition. Water-treatment GAC at 92–95% hardness disintegrates after 5–10 cycles. In gold CIP/CIL processing, the activated carbon adsorbs gold cyanide complex (Au(CN)₂⁻) from a leach slurry, gets pumped to an elution tank where hot caustic strips the gold for downstream electro-winning, then the carbon is acid-washed and thermally reactivated, and cycled back. A single carbon batch goes through 50–100 cycles over 6–18 months service life. Mechanical hardness is everything — soft carbon attrites into the slurry, lost as a fines fraction. Coconut-shell GAC has hardness 98–99% (ASTM D3802-79 ball-pan abrasion test) while bituminous-coal GAC is 92–95%. Standard mining-grade specs: hardness ≥98%, mesh 6×12 (1.7–3.4 mm), iodine ≥1100 mg/g, ash ≤3%, moisture ≤5%. Calgon SR-Plus, Haycarb GoldStream, and Norit ROW Gold are global benchmarks; Chinese coconut-shell GAC from Fujian and Hainan has gained market share.

Question 8

Is filter media regenerable? When does it pay vs replacement?

Accepted Answer

GAC is regenerable through 3–5 thermal reactivation cycles (800°C in steam, 5–15% mass loss per cycle); anthracite and quartz sand are not regenerable but last 5–10 years before replacement. Spent activated alumina is regenerable through 100+ cycles. Spent diatomite is single-use. Thermal reactivation of spent GAC happens at a centralized facility (Calgon Carbon, Cabot, Jacobi, ResinTech operate North American regen plants; Chinese regen is centralized in 河北、宁夏、山西) — the carbon is fired at 800°C in steam atmosphere to volatilize adsorbed organics and re-open pore structure. Each cycle loses 5–15% of the original capacity through structural collapse; after 3–5 cycles the carbon is too friable for further use and is disposed as non-hazardous waste (the volatilized organics are oxidized in the reactivation kiln afterburner). Economics: virgin GAC costs $1.5–3.0/kg; reactivation at $0.7–1.2/kg makes sense when transport to the regen facility is reasonable (< 500 km). Anthracite and quartz sand don't reactivate — they don't absorb anything chemically, they just depth-filter. They get replaced when accumulated micro-particles permanently block bed permeability (typically 5–10 years).

Question 9

What is NSF/ANSI 61 certification and why does it matter?

Accepted Answer

NSF/ANSI 61 is the North American standard for drinking-water system components — verifying that the material does not leach toxic substances (lead, arsenic, BTEX, etc.) into the treated water at levels above EPA / WHO drinking-water limits. Required by most US/Canadian municipalities, recommended for EU and APAC drinking-water specs. Testing protocol: install the activated carbon (or filter media) in a typical filter configuration, treat NSF-spec model water for 30 days at 50°C, measure leachate concentrations for ~30 regulated parameters. Pass threshold is < 10% of the EPA drinking-water MCL for each parameter. NSF certified products carry the NSF mark and certificate number — required by US drinking-water purchase orders, Canadian Health Canada drinking water specs, and increasingly required in EU drinking-water tenders. Chinese-origin GAC and anthracite have been increasingly NSF-certified through 2018–2025 (initial NSF certification cost is $30k–60k for the manufacturer plus annual fees). For non-drinking-water applications (industrial wastewater, mining, gas filtration), NSF/ANSI 61 is not required and the standard COA / RoHS / REACH chemical-purity testing suffices.

Question 10

How do Chinese activated carbon prices compare to Calgon, Cabot, Jacobi?

Accepted Answer

Chinese-origin GAC and anthracite are typically 40–60% lower CIF than equivalent international brand grades, with the gap widest on commodity water-treatment GAC and narrowing for NSF-certified drinking-water grades and high-spec mining-grade coconut-shell carbon. Commodity coal-based GAC (iodine 1000 mg/g, mesh 8×30) prices roughly $1.0–1.8/kg CIF from a Tier-1 Chinese producer (宁夏华辉, 山西新华化工, 河南巩义集群) vs Calgon F400 or Cabot Norit ROW at $2.5–3.5/kg. Quality has converged since 2018 — Chinese producers now operate continuous rotary-kiln activation furnaces and gel-grade quality control matching Western specs. For NSF/ANSI 61 certified drinking-water grades, the gap narrows to 20–30% ($2.0–2.5/kg Chinese vs $3.0–3.5/kg Western). For gold-mining coconut-shell GAC (hardness ≥98%, iodine ≥1100, mesh 6×12), the gap narrows further to 15–25% because only 2–3 Chinese producers are qualified (福建源升, 山东元拓 mainly). For specialty CO₂ capture or PFAS sorbent grades, Western brands retain technology leadership.

Question 11

What documents are available — COA, MSDS, TDS, NSF certificate?

Accepted Answer

Yes — Certificate of Analysis (COA), Safety Data Sheet (SDS/MSDS), Technical Data Sheet (TDS) standard on every order. NSF/ANSI 61 certificates available for drinking-water grades; food-contact compliance letters (FDA 21 CFR 173.20 for sugar grade, FDA 21 CFR 184.1366 for diatomite) on request. Activated carbon COA includes: iodine number (mg/g), methylene blue number, moisture, ash content, bulk density, particle size distribution, mesh fractions, hardness (ASTM D3802), pH of slurry, total heavy metals (As, Pb, Hg, Cd per AWWA / EPA limits). SDS is prepared to GHS Rev. 7 / EU CLP format, available in English, Chinese, Spanish, German. TDS covers iodine-number to capacity correlation, expected service-life calculations, regeneration recommendations, packaging and storage. For drinking-water grade, NSF/ANSI 61 certificate listing the certified facility number and product mark is mandatory. For sugar / food-grade carbon, additional FDA 21 CFR 173.20 (activated carbon as food adsorbent) compliance letter is provided. For diatomite, FDA 21 CFR 184.1366 (food-grade diatomite GRAS status) compliance is the equivalent.

Question 12

What is the MOQ and packaging?

Accepted Answer

Starter samples 5–10 kg; standard commercial MOQ is 500 kg for activated carbon and anthracite, 200 kg for diatomite. Packaging: 25 kg woven bag with PE liner (most common), 500–600 kg jumbo bag, or 25 t bulk container loads. Activated carbon shelf life is 2 years from manufacture in original sealed PE-lined woven bag, stored below 30°C in a dry environment. The carbon absorbs ambient water vapor — opening packaging requires using the product within 30–60 days for best capacity retention. Anthracite filter media has indefinite shelf life when stored dry. Diatomite filter aid shelf life is 5+ years in original sealed packaging (it's already a fully-fired ceramic powder). Container-load economics: 20-foot container holds ~24 t activated carbon (low density), 25 t anthracite, 18 t diatomite (lowest density due to porosity). Sea-freight Asia-EU 4-5 weeks, Asia-North America 3-4 weeks, Asia-India 10-15 days, Asia-SEA 5-7 days. Inland Africa or LatAm port FOB pricing is standard; CIF / DDP available for established repeat buyers.

Application	Primary Filter Media	Specs	Bed Configuration	Service Life
Municipal Drinking Water Pre-filtration	Anthracite + Quartz Sand + Garnet	Anthracite 1.0–1.5 mm; sand 0.5–0.8 mm; garnet 0.3 mm	Multi-media 60+30+15 cm	5–10 years
Municipal Drinking Water Polishing	Granular Activated Carbon (GAC)	Coal-based, iodine number ≥900 mg/g, mesh 8×30	GAC bed 60–90 cm @ EBCT 10 min	2–3 years before regeneration
Swimming Pool Filtration	Quartz Sand + Anthracite	Sand 0.45–0.85 mm; anthracite 0.8–1.6 mm	Dual media 40+30 cm	5–7 years
Industrial Cooling Water Circulation	Quartz Sand + Anthracite	Sand 0.5–1.2 mm; anthracite 1.0–2.0 mm	Dual media 50+30 cm	3–5 years
Mining Gold Leach (CIP/CIL)	Activated Carbon (Gold Grade)	Coconut-shell or coal, 6×12 mesh, hardness ≥98%	Adsorption-elution column	1–2 years (multiple regeneration cycles)
Sugar Mill Decolorizing	Activated Carbon (Powder PAC, Sugar Grade)	PAC, iodine ≥1000 mg/g, decolorizing ≥18 mL/g	Batch contact + filter press	Single-use, then incineration
Brewery / Wine Clarification	Diatomite Filter Aid	Mining grade, calcined or flux-calcined	Precoat 0.5–1.5 kg/m² + body feed	Single-use (food-grade)
Ozone / Hydrogen Peroxide Polishing	Granular Activated Carbon (Catalytic)	Coal-based catalytic, iodine ≥850 mg/g	GAC bed 60 cm @ EBCT 8 min	3–5 years
VOC Air Treatment	Granular Activated Carbon (Coal)	Coal-based, CTC ≥60%, mesh 4×8	Adsorption-desorption column	2–4 years
CO₂ Capture (Post-combustion)	Activated Carbon CO₂ Adsorbent	Specialty MEA-impregnated or molecular sieve hybrid	Fixed bed with regeneration cycle	5+ years
Soil Remediation (PFAS / Petroleum)	Activated Carbon (Soil Sorbent)	Coal-based or biochar, particle 0.5–2.5 mm	Trench injection or surface mixing	Permanent in-situ
Defluoridation (Drinking Water)	Activated Alumina (see separate hub)	Bead 3–6 mm, BET ≥280 m²/g	Fixed bed @ EBCT 15 min	1–3 years before regeneration

International Brand Grade	China Equivalent	Major Chinese Producers
Calgon Carbon F400 (coal GAC, iodine 1050)	Coal GAC iodine ≥1000 mg/g	巩义市净水材料厂家集群, 山西新华化工, 宁夏华辉
Calgon Carbon F300 (coal GAC, iodine 950)	Coal GAC iodine ≥900 mg/g	宁夏华辉, 山西大同, 山西新华化工
Cabot Norit ROW 0.8 Supra (coal GAC)	Coal GAC mesh 8×30, iodine 950	巩义市集群, 山西阳泉
Calgon Carbon AquaCarb (catalytic)	Catalytic coal GAC iodine ≥850 mg/g	宁夏华辉, 山西大同, 福建源升
Coconut-shell GAC (Jacobi, Haycarb)	Coconut-shell GAC iodine ≥1100 mg/g, hardness ≥98%	福建源升, 海南椰壳, 山东元拓
Anthracite Filter Coal (Pure Aqua, Northern Filter)	Anthracite filter media 0.8–1.6 mm, hardness ≥7	宁夏华辉, 河南巩义市集群, 河北邯郸
Celite 545 (Imerys, calcined diatomite)	Calcined diatomite filter aid 545-equivalent	嵊州市旭日, 浙江嘉善硅藻土
Celite 503 (Imerys, flux-calcined diatomite)	Flux-calcined diatomite filter aid	嵊州市旭日, 浙江嘉善硅藻土
Calgon SR-Plus (gold mining CIP)	Coconut-shell gold-grade carbon, hardness ≥99%	福建源升, 山东元拓
Norit GAC 1240 (sugar decolorizing PAC)	Sugar-grade PAC iodine ≥1000, decolor ≥18 mL/g	宁夏华辉, 山西新华化工
3M Filtersorb (PFAS remediation)	Activated carbon (PFAS-grade, soil/groundwater)	宁夏华辉, 山西大同 (specialty grade)

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