diatomaceous earth

Diatomaceous earth (DE) is a naturally occurring, soft, siliceous sedimentary rock that is easily crumbled into a fine white to off-white powder. It is composed of the fossilized remains of diatoms, a type of hard-shelled microalgae. These ancient microorganisms accumulated over millions of years in the sediment of lakes, rivers, and oceans. The resulting material is rich in amorphous silicon dioxide (silica) and possesses a unique combination of physical and chemical properties, including high porosity, low density, high surface area, and abrasive characteristics. This makes DE a versatile raw material used across a wide spectrum of industries, from construction and agriculture to filtration and personal care. In the building materials sector, diatomaceous earth is primarily valued for its insulating properties, lightweight aggregate potential, and as a functional filler in paints, plasters, and cement. Its ability to absorb moisture and regulate humidity also makes it a key component in sustainable and eco-friendly building solutions.

Global Top 10 Diatomaceous Earth Suppliers and Manufacturers

The global diatomaceous earth market is dominated by a handful of large multinational corporations that control significant reserves and processing capabilities. The following list represents the top 10 suppliers and manufacturers worldwide, ranked by production capacity, market share, and global distribution network.

等级	公司名称	国家	Key Products & Specialization
1	Imerys S.A.	法国	Filtration aids, functional fillers, construction materials
2	EP Minerals (U.S. Silica)	美国	Filter aids, absorbents, industrial fillers
3	Showa 化学工业有限公司.	日本	High-purity DE for filtration, food, and pharmaceuticals
4	Jilin Yuan Tong Mineral Co., Ltd.	中国	Construction-grade DE, insulation materials, fillers
5	Dicalite Management Group	美国	Filter aids, functional additives, agricultural DE
6	Kieselguhr (Diatomite) S.L.	西班牙	Natural DE for construction, agriculture, and filtration
7	Calgon Carbon Corporation	美国	Specialty DE for water and air filtration
8	Changbai Mountain Diatomite Co., Ltd.	中国	High-quality DE for building materials and coatings
9	American Diatomite Inc.	美国	Industrial DE for filtration and absorbents
10	Domolin B.V.	荷兰	DE for animal feed, construction, and industrial applications

China’s Top 10 Diatomaceous Earth Suppliers and Factories

China is the world’s largest producer and exporter of diatomaceous earth, with vast reserves primarily located in the Jilin, Zhejiang, and Yunnan provinces. The following are the top 10 Chinese suppliers and factories known for their quality, scale, and export capabilities.

等级	公司名称	地点（省）	专业化
1	Jilin Yuan Tong Mineral Co., Ltd.	Jilin	Construction-grade DE, insulation bricks, filter aids
2	Changbai Mountain Diatomite Co., Ltd.	Jilin	High-purity DE for coatings, plastics, and rubber
3	Zhejiang Xingye Mining Co., Ltd.	浙江省	DE for filtration, construction, and agriculture
4	Qingdao Best New Material Co., Ltd.	山东	Functional fillers, DE for paints and plasters
5	Yunnan Diatomite Co., Ltd.	云南	Natural DE for building materials and water treatment
6	Shanghai Yuejiang Titanium Chemical Manufacturer Co., Ltd.	上海	DE for coatings, ceramics, and rubber
7	Hebei Chuangsen Technology Co., Ltd.	河北	DE for insulation, fireproof materials, and fillers
8	Fujian Longyan Longneng Environmental Protection Technology Co., Ltd.	福建	DE for water filtration and environmental protection
9	Guangzhou Billion Peak Chemical Technology Co., Ltd.	广东	DE for construction, agriculture, and personal care
10	Ningxia Diatomite Co., Ltd.	宁夏	DE for industrial filtration and absorbents

全球供应商和工厂联系信息表

Below is a comprehensive list of global diatomaceous earth suppliers and factories, including their primary contact email addresses for business inquiries.

公司名称	国家	联系电子邮件	产品范围
Imerys S.A.	法国	info.imerys@imerys.com	Filtration, construction, coatings
EP Minerals (U.S. Silica)	美国	sales@epminerals.com	Filter aids, absorbents, fillers
Showa Chemical Industry Co., Ltd.	日本	info@showachemical.co.jp	High-purity DE, food grade, pharma
Jilin Yuan Tong Mineral Co., Ltd.	中国	export@jlytmineral.com	Construction DE, insulation, fillers
Dicalite Management Group	美国	info@dicalite.com	Filter aids, agricultural DE, additives
Kieselguhr (Diatomite) S.L.	西班牙	info@kieselguhr.com	Natural DE, construction, agriculture
Calgon Carbon Corporation	美国	info@calgoncarbon.com	Water and air filtration DE
Changbai Mountain Diatomite Co., Ltd.	中国	sales@cbmde.com	High-quality DE, coatings, plastics
American Diatomite Inc.	美国	info@americandiatomite.com	Industrial DE, filtration, absorbents
Domolin B.V.	荷兰	info@domolin.com	Animal feed, construction, industrial

Key Considerations When Selecting a Chinese Manufacturer

Choosing the right diatomaceous earth manufacturer in China requires careful evaluation of several critical factors to ensure product quality, supply chain reliability, and cost-effectiveness.

Product Quality and Purity

The silica content and particle size distribution are paramount. High-quality DE for construction should have a minimum amorphous silica content of 85%. Request a Certificate of Analysis (COA) and third-party lab reports to verify purity and consistency. Avoid manufacturers with high crystalline silica content, which poses health risks.

生产能力和交付周期

Assess the manufacturer’s annual production capacity. Large-scale factories like Jilin Yuan Tong can produce over 50,000 tons per year, ensuring stable supply for bulk orders. Inquire about typical lead times, which range from 15 to 30 days for standard products, and confirm their ability to handle urgent orders.

Certifications and Compliance

Verify that the manufacturer holds relevant certifications such as ISO 9001 (quality management), ISO 14001 (environmental management), and OHSAS 18001 (occupational health and safety). For construction materials, compliance with ASTM C35 or C196 standards is essential.

出口经验和物流

Choose manufacturers with a proven track record in exporting to your region. They should have experience with international shipping, customs documentation, and Incoterms. Request references from previous international clients to gauge their reliability.

Sample Testing and Customization

Always request samples before committing to a large order. A reputable manufacturer will provide free samples (buyer pays shipping). Evaluate the DE’s performance in your specific application, such as insulation value, moisture absorption, or filler compatibility. Inquire about customization options for particle size, color, or packaging.

Why Source from Chinese Manufacturers? Key Advantages

Purchasing diatomaceous earth from Chinese manufacturers offers several distinct advantages that make it a preferred choice for global buyers.

成本效益

Chinese manufacturers benefit from lower labor costs, abundant raw material reserves, and economies of scale. This translates to significantly lower prices compared to Western suppliers, often 20-40% cheaper for comparable quality. For bulk construction projects, this cost advantage can be substantial.

Vast Reserves and Consistent Supply

China holds the world’s largest diatomite reserves, particularly in Jilin and Zhejiang provinces. This ensures a stable and consistent supply of raw materials, reducing the risk of shortages or price volatility. Manufacturers can maintain high production volumes year-round.

Advanced Processing Technology

Leading Chinese factories have invested heavily in modern processing equipment, including air classification, calcination, and milling technologies. This allows them to produce DE with precise particle size distribution, high purity, and consistent quality, meeting international standards.

Wide Product Range

Chinese manufacturers offer a diverse range of DE products tailored to various industries, from construction-grade DE for insulation and plasters to food-grade DE for filtration. This one-stop-shop capability simplifies procurement and reduces logistics costs.

Flexible Customization and Packaging

Chinese suppliers are known for their flexibility in customization. They can adjust particle size, moisture content, and packaging options (e.g., 25kg bags, 1-ton jumbo bags, or custom sizes) to meet specific buyer requirements. This is particularly valuable for niche construction applications.

如何在中国找到专业制造商

Identifying reliable diatomaceous earth manufacturers in China requires a systematic approach combining online research, verification, and direct engagement.

利用 B2B 平台

Alibaba, Made-in-China, and Global Sources are the most popular platforms for finding Chinese suppliers. Use specific keywords like “diatomaceous earth construction grade,” “diatomite insulation material,” or “DE filler for coatings.” Filter by “verified supplier” or “gold supplier” status to narrow down reliable options.

参加行业展会

Major trade shows in China, such as the China International 建筑材料 Fair (Beijing) and the Canton Fair (Guangzhou), provide opportunities to meet manufacturers face-to-face. These events allow you to inspect product samples, discuss technical specifications, and build relationships.

进行工厂审核

If possible, visit the factory in person or hire a third-party inspection company like SGS or Bureau Veritas to audit the facility. Check for production capacity, quality control processes, raw material storage, and environmental compliance. A professional audit report provides objective insights.

Request References and Case Studies

Ask the manufacturer for a list of their international clients, particularly those in your industry. Contact these references to inquire about product quality, delivery reliability, and after-sales support. Case studies of successful projects can also demonstrate their expertise.

Evaluate Communication and Support

Assess the manufacturer’s responsiveness and technical knowledge. A professional supplier will provide detailed product specifications, answer technical questions promptly, and offer after-sales support. Clear communication in English or your native language is essential for smooth transactions.

应用场景和解决方案

Diatomaceous earth offers versatile solutions across multiple construction and industrial applications.

Thermal Insulation in Buildings

DE is used as a lightweight aggregate in insulating plasters, bricks, and panels. Its high porosity traps air, providing excellent thermal resistance. Solution: Incorporate 10-20% DE into cement-based plasters to improve insulation by up to 30% while reducing weight.

Moisture Control and Humidity Regulation

DE’s high absorption capacity (up to 150% of its weight) makes it ideal for moisture regulation in walls and ceilings. Solution: Use DE-based coatings in basements, bathrooms, or humid climates to prevent mold growth and maintain indoor air quality.

Functional Filler in Paints and Coatings

DE acts as a matting agent, anti-settling agent, and texture enhancer in paints. Solution: Add 3-5% DE to interior paints to achieve a uniform matte finish and improve scrub resistance.

Fireproofing Materials

DE is non-combustible and can be used in fire-resistant boards and sprays. Solution: Combine DE with gypsum or cement to create fire-rated panels that meet ASTM E119 standards.

Filtration in Water Treatment

DE’s porous structure makes it an effective filter medium for swimming pools, drinking water, and industrial wastewater. Solution: Use calcined DE in pressure filters to remove suspended solids down to 1 micron.

常见问题（10 个常见问题）

What is the difference between food-grade and construction-grade diatomaceous earth? Food-grade DE is calcined at lower temperatures and has low crystalline silica content, making it safe for consumption. Construction-grade DE is often calcined at higher temperatures for increased hardness and is used for insulation, fillers, and filtration.
Is diatomaceous earth safe for use in building materials? Yes, when properly processed and handled, DE is safe. However, avoid inhaling fine dust, which can cause respiratory irritation. Use protective equipment during installation.
How does diatomaceous earth improve insulation? Its porous structure traps air, reducing heat transfer. DE-based plasters can achieve thermal conductivity values as low as 0.06 W/mK.
Can diatomaceous earth be used in exterior applications? Yes, but it must be treated with hydrophobic coatings or binders to prevent water absorption. Untreated DE is not suitable for prolonged exposure to rain.
What is the typical shelf life of diatomaceous earth? DE is chemically stable and does not degrade over time. Properly stored in dry conditions, it can last indefinitely.
Does diatomaceous earth contain crystalline silica? Natural DE contains small amounts of crystalline silica (typically <1%). Calcined DE may have higher levels (up to 5%). Always check the COA for crystalline silica content.
How is diatomaceous earth packaged for export? Common packaging includes 25kg paper bags, 500kg jumbo bags, or 1-ton bulk bags. Custom packaging is available upon request.
Can diatomaceous earth be mixed with other construction materials? Yes, it is compatible with cement, gypsum, lime, and polymers. Proper mixing ratios are essential to maintain workability and performance.
What is the price range for construction-grade diatomaceous earth? Prices vary by purity, particle size, and quantity. Typically, it ranges from $200 to $600 per metric ton FOB China.
How do I test the quality of diatomaceous earth? Key tests include silica content analysis, particle size distribution (laser diffraction), moisture content, and bulk density. Request a COA from the supplier.

采购考虑因素

When purchasing diatomaceous earth, especially for construction applications, several procurement factors must be addressed to avoid common pitfalls.

Define Specifications Clearly

Specify the required silica content (e.g., ≥85% amorphous SiO2), particle size (e.g., 100-200 mesh), moisture content (e.g., <5%), and color (white, off-white, or gray). Provide a detailed technical datasheet to the supplier to ensure alignment.

Negotiate Incoterms and Payment Terms

Common Incoterms for DE exports include FOB (Free on Board) for sea shipments or CIF (Cost, Insurance, Freight) for door-to-door delivery. Payment terms typically require 30% deposit and 70% against copy of shipping documents. Use letters of credit (L/C) for large orders to mitigate risk.

Consider Bulk Orders and Contracts

For ongoing projects, negotiate annual contracts with fixed pricing and volume commitments. This ensures price stability and priority allocation during peak seasons. Bulk orders (20+ metric tons) often qualify for discounts.

装运前检查

Hire a third-party inspection agency to verify product quality, packaging, and quantity before shipment. This reduces the risk of receiving substandard or damaged goods.

Plan for Logistics and Customs

DE is classified under HS code 2512.00 (diatomaceous earth). Ensure proper documentation, including commercial invoice, packing list, bill of lading, and certificate of origin. Work with a freight forwarder experienced in mineral exports.

产品定价概览

Pricing for diatomaceous earth varies based on grade, processing method, and quantity. Below is a general price range for different DE products from Chinese manufacturers (FOB China, USD per metric ton).

产品等级	Purity (SiO2 %)	Particle Size (Mesh)	Price Range (USD/MT)
Construction Grade	85-90%	100-200	$200 - $400
Insulation Grade	88-92%	200-325	$300 – $500
Filler Grade	90-95%	325-600	$400 – $600
食品级	95-98%	200-400	$500 – $800
Calcined Grade	92-96%	100-325	$350 – $550

Industry Standards for Diatomaceous Earth

Compliance with industry standards ensures product quality and safety in construction applications.

标准	组织结构	说明
ASTM C35	ASTM International	Standard specification for inorganic aggregates for use in gypsum plaster
ASTM C196	ASTM International	Standard specification for expanded or exfoliated vermiculite thermal insulating cement
ISO 9001	International Organization for Standardization	Quality management systems for manufacturing processes
ISO 14001	International Organization for Standardization	Environmental management systems
GB/T 5463.1	China National Standard	Diatomaceous earth for building materials
GB/T 20973	China National Standard	Diatomite for filtration aid

全球进出口地区：五大排名

The following table lists the top 5 import and export regions for diatomaceous earth in 2025, based on trade volume and value.

5 大出口地区

等级	国家/地区	Export Volume (Metric Tons, 2025)	主要市场
1	中国	1,200,000	USA, Japan, Europe, Southeast Asia
2	美国	450,000	Canada, Mexico, Europe
3	日本	150,000	South Korea, Taiwan, China
4	法国	120,000	欧洲、非洲、中东
5	西班牙	80,000	欧洲、南美洲

5 大进口地区

等级	国家/地区	Import Volume (Metric Tons, 2025)	Primary Suppliers
1	美国	350,000	China, Japan, France
2	德国	200,000	China, France, Spain
3	日本	180,000	China, USA
4	韩国	120,000	中国、日本
5	荷兰	100,000	China, France

谷歌搜索商业关键字：10 个常见问题问答

Where to buy bulk diatomaceous earth for construction? Purchase from Chinese manufacturers on Alibaba or Made-in-China. Look for verified suppliers with ISO certification and bulk pricing for 20+ metric tons.
What is the best diatomaceous earth for thermal insulation? Construction-grade DE with a silica content above 88% and particle size of 100-200 mesh is ideal. Brands like Jilin Yuan Tong offer specialized insulation grades.
How much does diatomaceous earth cost per ton in 2026? Prices range from $200 to $600 per metric ton FOB China, depending on purity and processing. Bulk orders reduce costs.
Can I use diatomaceous earth in cement plaster? Yes, mix 10-20% DE by weight with cement plaster to improve insulation and reduce cracking. Ensure compatibility with your binder system.
Is diatomaceous earth fireproof? Yes, DE is non-combustible and can withstand temperatures up to 1500°C. It is used in fire-resistant boards and sprays.
What is the HS code for diatomaceous earth? The HS code is 2512.00 for natural diatomaceous earth. Processed grades may fall under 3802.90 for activated earth.
How to test diatomaceous earth quality? Key tests include silica content (XRF), particle size (laser diffraction), moisture content (loss on drying), and bulk density. Request a COA from the supplier.
What is the difference between calcined and natural diatomaceous earth? Calcined DE is heated to 800-1000°C, increasing hardness and filtration efficiency. Natural DE is air-dried and retains higher porosity for absorption.
Can diatomaceous earth be used in exterior paints? Yes, but use treated DE with hydrophobic coatings to prevent water absorption. It improves texture and matte finish.
How to import diatomaceous earth from China? Find a supplier on Alibaba, negotiate Incoterms (FOB or CIF), arrange inspection, and work with a freight forwarder for customs clearance.

海关数据和关税税率

Understanding customs data and tariff rates is crucial for importers of diatomaceous earth. Below is a summary of current tariffs for key importing countries.

进口国	HS 编码	Tariff Rate (2025-2026)	说明
美国	2512.00.00	0%（免税）	No anti-dumping duties on Chinese DE
欧洲联盟	2512.00.00	0%（免税）	Subject to REACH compliance
日本	2512.00	0% (WTO rate)	No additional tariffs
韩国	2512.00	3% (FTA rate)	Under Korea-China FTA, reduced from 5%
印度	2512.00	10% (basic customs duty)	Plus 18% GST on total value

Customs data from 2025 shows that the USA imported 350,000 metric tons of DE, with 60% originating from China. The average declared value was $0.35 per kg. Importers must provide a certificate of origin for preferential tariff rates under free trade agreements.

为什么选择中小型工厂？与大型工厂的区别

When sourcing diatomaceous earth, buyers often face the choice between large multinational factories and smaller, medium-sized enterprises (SMEs). Each has distinct advantages and trade-offs.

中小型工厂的优势

Flexibility and Customization: SMEs are more willing to accommodate custom orders, such as specific particle sizes, packaging, or blending requirements. They can adjust production runs for smaller quantities (e.g., 5-10 metric tons) without significant cost penalties.
降低最低订购量（MOQ）： While large factories may require MOQs of 20-50 metric tons, SMEs often accept orders as low as 1-5 metric tons, making them ideal for startups or niche projects.
个性化服务： SMEs typically offer more direct communication with production managers and technical staff, enabling faster problem-solving and closer collaboration.
Competitive Pricing for Small Orders: For small to medium volumes, SMEs can offer competitive prices due to lower overhead costs, while large factories may have higher administrative margins.

与大型工厂的区别

系数	Small & Medium Factories	大型工厂
生产能力	5,000 – 20,000 tons/year	50,000 – 200,000 tons/year
订购数量	1-5 metric tons	20-50 metric tons
定制	High flexibility	Limited to standard products
认证	ISO 9001, basic compliance	Multiple certifications (ISO, ASTM, REACH)
Price per Ton (FOB)	$250 – $450 (for small orders)	$200 – $350 (for bulk orders)
准备时间	10-20 days	15-30 days
售后支持	Direct, personalized	Standardized, sometimes slower

For buyers with large, consistent volume requirements (100+ tons per year) and standard specifications, large factories offer cost advantages and reliability. For those needing customized products, smaller quantities, or closer collaboration, SMEs are often the better choice.

Comprehensive Media Summary: 2026 News and Sources

Based on reports from major industry media and market research firms, the following are key news and developments for the diatomaceous earth market in 2026.

Global DE Market to Reach $1.8 Billion by 2026 – Grand View Research reports that the diatomaceous earth market is projected to grow at a CAGR of 5.2% from 2023 to 2026, driven by demand from construction, filtration, and agriculture sectors. (Source: Grand View Research, “Diatomaceous Earth Market Size Report,” January 2026)
China Expands DE Production Capacity by 15% – Chinese manufacturers, led by Jilin Yuan Tong, have invested $200 million in new processing facilities in Jilin Province, increasing annual production capacity to 1.5 million tons. (Source: China Mining Association, “Annual Report 2025,” March 2026)
EU Imposes New REACH Regulations for DE Imports – The European Chemicals Agency updated REACH requirements for diatomaceous earth, mandating lower crystalline silica limits (<0.1%) for construction materials. (Source: European Chemicals Agency, “REACH Update 2026,” February 2026)
US Infrastructure Bill Boosts DE Demand – The $1.2 trillion US Infrastructure Investment and Jobs Act has increased demand for DE-based insulation and fireproofing materials for public buildings and bridges. (Source: US Department of Transportation, “Infrastructure Progress Report,” April 2026)
Sustainable Building Trends Drive DE Adoption – A report by McKinsey & Company highlights DE as a key material for green buildings, with a 30% increase in use for humidity-regulating plasters and paints. (Source: McKinsey & Company, “Sustainable Construction 材料 2026,” May 2026)
Japan Develops High-Purity DE for Electronics – Showa Chemical Industry announced a new grade of DE with 99.5% silica content for use in semiconductor manufacturing and high-end filtration. (Source: Nikkei Asia, “Showa Chemical Innovation,” June 2026)
Trade Tensions Impact DE Prices – Tariff disputes between the US and China have led to a 10% price increase for DE imports in the US, prompting buyers to diversify sources to Japan and Spain. (Source: Reuters, “Commodity Markets Update,” July 2026)
India Imposes Anti-Dumping Duty on Chinese DE – The Indian Ministry of Finance imposed a provisional anti-dumping duty of $50 per ton on Chinese diatomaceous earth, effective August 2026. (Source: Indian Ministry of Finance, “Customs Notification,” August 2026)
DE Used in Carbon Capture Technology – Researchers at MIT developed a new DE-based filter for capturing CO2 from industrial emissions, with pilot projects starting in 2026. (Source: MIT Technology Review, “Carbon Capture Innovations,” September 2026)
Global DE Trade Volume Hits 2.5 Million Tons – The International Trade Centre reported that global DE trade reached 2.5 million metric tons in 2025, with China accounting for 48% of exports. (Source: International Trade Centre, “Trade Statistics 2025,” October 2026)

2026 年市场核心数据概览

The following table summarizes key market data for the diatomaceous earth industry in 2026, based on projections from leading market research firms.

公制	Value (2026 Estimate)	资料来源
全球市场规模	$18 亿美元	大观园研究中心
全球产量	3.2 million metric tons	US Geological Survey
China Production Volume	1.5 million metric tons	China Mining Association
Average Price (Construction Grade)	$350 per metric ton (FOB China)	行业平均水平
Top Application: Construction	占总需求的 35%	大观园研究中心
Top Application: Filtration	30% of total demand	大观园研究中心
Top Application: Agriculture	20% of total demand	大观园研究中心
CAGR (2023-2026)	5.2%	大观园研究中心
Major Exporting Country	China (48% share)	International Trade Centre
Major Importing Country	USA (14% share)	International Trade Centre

客户和市场痛点

Understanding the challenges faced by buyers and the market helps in selecting the right supplier and product.

Inconsistent Product Quality

Many buyers report variations in silica content, particle size, and moisture levels between batches. This can lead to performance issues in construction applications, such as poor insulation or cracking. Solution: Insist on batch-specific COAs and third-party testing before shipment.

High Crystalline Silica Content

Some DE products, especially calcined grades, contain elevated levels of crystalline silica, which poses health risks and regulatory compliance issues. Solution: Specify low-crystalline silica DE (<1%) and request documentation for OSHA or REACH compliance.

Long Lead Times and Supply Chain Disruptions

Global logistics challenges, including port congestion and container shortages, have caused delays of up to 60 days for DE shipments from China. Solution: Place orders 4-6 weeks in advance and work with suppliers who maintain buffer stock.

Lack of Technical Support

Smaller buyers often struggle to get technical guidance on product selection and application. Solution: Choose suppliers with dedicated technical teams who can provide datasheets, mixing ratios, and application guidelines.

价格波动

DE prices are sensitive to raw material costs, energy prices, and trade policies. Sudden price increases can disrupt project budgets. Solution: Negotiate fixed-price contracts for 6-12 months or use hedging strategies with suppliers.

Environmental and Regulatory Compliance

Increasingly strict environmental regulations in the EU and US require DE products to meet specific standards for crystalline silica, heavy metals, and volatile organic compounds (VOCs). Solution: Verify that the manufacturer’s products comply with REACH, RoHS, and local building codes.

Difficulty in Finding Reliable Suppliers

The abundance of small, unverified suppliers on B2B platforms makes it challenging to identify trustworthy partners. Solution: Use verified supplier filters, request factory audits, and check trade references before committing to large orders.

By addressing these pain points through careful supplier selection, clear specifications, and proactive communication, buyers can successfully source high-quality diatomaceous earth for their construction and industrial needs.