II. Details of Product Appearance and Form

• Color: The mainstream specifications are light yellow or golden yellow powder/fine granules; the high-purity specification (for food-grade use only) is white powder, free of mixed colors, blackened granules, and visible impurities, with a uniform and consistent color.
•  
• Status: Dry and loose, no caking or clumping, good fluidity; the powder is fine without rough feeling, and the particle size is uniform (the conventional particle size is 80-120 mesh, which can be customized according to customer requirements) without obvious mechanical impurities.
•  
• Solubility: Easily soluble in water at room temperature with a fast dissolution rate (complete dissolution within 3–5 minutes under stirring). The resulting aqueous solution is pale yellow and transparent, with no obvious insoluble precipitates. It exhibits high stability after dissolution and is not prone to stratification.
•  
• Stability: When stored in a dry and sealed state at room temperature, it can maintain stable performance for a long time (shelf life: 12 months), without moisture absorption, volatilization or decomposition. It tends to cake if exposed to moisture; however, the caked product can still be used normally after crushing and dissolving, without affecting its flocculation effect.
•  
• Odor: No abnormal odor or irritating odor, meets the hygienic requirements for drinking water treatment agents, and does not cause any abnormal odor to the treated drinking water.
•  
• 

• III. Core Product Features

  (I) High purity with extremely low impurity content

  Food-grade raw materials are strictly selected. The production process adopts multiple filtration (precision filtration + deep filtration) and refined purification technologies, which effectively remove heavy metal impurities such as lead, cadmium, arsenic, mercury and chromium, as well as mechanical impurities and insoluble substances. All indicators strictly comply with GB 15892-2020 *Polyaluminum Chloride for Drinking Water Treatment*.
  The content of insoluble substances is much lower than that of industrial-grade PAC, and the heavy metal content is controlled within the limits specified in the national drinking water standards. The treated drinking water is free of chemical residues and odors, ensuring drinking water safety from the source.

  (II) Strong flocculation effect and fast sedimentation speed

  As an inorganic polymer flocculant, its molecular structure exhibits strong adsorption and bridging effects. When added to water, it can rapidly adsorb suspended solids, colloidal particles, organic matter, micro-impurities and other substances in the water body, forming large and compact flocs with a fast sedimentation rate (sedimentation time is shortened by more than 30% compared with traditional aluminum sulfate). It can effectively shorten the precipitation time and improve water purification efficiency. Meanwhile, it demonstrates good adaptability to raw water with low temperature, low turbidity and high turbidity, solving the problems of poor flocculation effect and slow sedimentation of traditional flocculants in a low-temperature environment (0-10℃), and meeting the purification needs of different seasons and water qualities.

  (Ⅲ) Low dosage and low usage cost

  With the same water purification effect, the dosage of solid drinking-water grade PAC is only 1/3 to 1/2 that of traditional aluminum sulfate. The lower dosage not only directly reduces the chemical cost, but also decreases the amount of sludge produced during water purification (sludge volume is reduced by approximately 40% compared with aluminum sulfate), cutting down sludge treatment costs. Meanwhile, it lessens the secondary impact of chemicals on water bodies, balancing economic efficiency and environmental friendliness, making it suitable for long-term use in large-scale drinking water purification projects.

  (IV) Wide applicable pH range and strong adaptability

  It is suitable for water bodies with a pH range of 5.0 to 9.0, and the optimal applicable pH is 6.5 to 7.8. A good flocculation effect can be achieved without additional acid-base regulators to adjust the water pH. It can adapt to the purification needs of different types of raw water (surface water, groundwater, high-turbidity water in flood seasons, low-temperature and low-turbidity water, iron and manganese-containing groundwater), without frequent adjustment of the dosing scheme. It is easy to operate and reduces the labor intensity of operators.

  (V) Low corrosiveness and friendly to equipment

  Compared with traditional flocculants such as hydrochloric acid and aluminum sulfate, solid drinking-grade PAC has extremely low corrosivity. It has no obvious corrosive effect on facilities such as pipelines, chemical dosing equipment, filters, and sedimentation tanks in waterworks. It can extend the service life of equipment, reduce equipment maintenance costs, lower potential safety hazards in the production process, and be adapted to various water purification equipment for drinking water.

  (VI) The treated water is of excellent quality and meets drinking standards.

  After water purification, the effluent has low turbidity (can be reduced to below 1 NTU) and low residual aluminum content (complies with the limits specified in GB 5749-2022 "Standards for Drinking Water Quality"). It is free of odor and harmful substance residues, without affecting the taste of drinking water. The treated water quality can be directly used for scenarios such as domestic drinking, food processing, and beverage production, ensuring water safety.

  (Ⅶ) Easy to store, transport and measure

  Compared with liquid PAC, solid PAC does not require special storage tanks for storage. It can be stored in a dry and ventilated environment after being sealed and packaged. It is not easy to leak or deteriorate during transportation, and its transportation cost is lower than that of liquid PAC; at the same time, solid PAC is convenient for accurate metering. The dosage can be flexibly adjusted according to the turbidity of raw water, avoiding poor water purification effect or waste of chemicals caused by metering errors.

   

  IV. Product Usage and Application Scenarios

  (I) Core Purpose: Purification of drinking water (the primary application field)

  The core application of solid drinking water-grade PAC is the purification of drinking water. It is specifically designed for various water supply scenarios with extremely high requirements for water quality safety. Through processes such as flocculation, sedimentation, and filtration, it effectively removes suspended solids, colloids, organic matter, heavy metal ions, and fine impurities from raw water, ensuring that the water quality meets the standards for domestic drinking water. As such, it is a key agent for safeguarding drinking water safety.

  (II) Main Application Scenarios

  1. Raw water purification in urban waterworks

  It is suitable for the purification of surface water (river, lake and reservoir water) in urban waterworks. It can treat raw water with varying turbidity levels, especially high-turbidity water during flood seasons and low-temperature and low-turbidity water in winter. It can rapidly reduce the turbidity of raw water, remove impurities, improve the water purification efficiency of waterworks, and ensure the safety of drinking water for urban residents. As one of the core agents in urban water supply systems, it is widely used in the conventional treatment processes of large and medium-sized waterworks.

  2. Township Centralized Water Supply Project

  In view of the characteristics of centralized water supply in townships (large fluctuations in raw water quality, relatively simple treatment equipment, and moderate professional competence of operators), solid drinking-water grade PAC is easy to operate and delivers stable flocculation effects. It requires no complicated dosing equipment and can be directly dissolved before application. It can effectively purify surface water and groundwater in townships, addressing the drinking water safety issues of rural residents. It is widely used in township centralized water supply stations, small water purification plants, community water supply stations, and other facilities.

  3. Rural Safe Drinking Water Project

  It is suitable for scenarios such as decentralized water supply and centralized water supply in rural areas. It can purify rural groundwater (containing fluorine, iron, manganese, and suspended solids), mountain spring water, river water, etc. Featuring simple operation and low cost, it requires no professional equipment. Farmers can dissolve and apply it proportionally by themselves, effectively removing impurities and harmful components in water, ensuring the drinking safety of rural residents, and supporting the implementation of rural safe drinking water projects. It is applicable to single households, multi-household centralized water supply, and village-level water supply stations in rural areas.

   

  

  4. Pretreatment of Process Water for the Food and Beverage Industry

  Pretreatment of process water for food processing and beverage production, such as in the mineral water, purified water, fruit juice, dairy products, and drinking water bottling industries. It removes impurities including suspended solids, colloids, and organic matter from raw water, providing qualified influent for subsequent advanced treatments such as reverse osmosis, ultrafiltration, and disinfection. This ensures the quality and safety of food and beverage products and complies with the hygienic standards of the food industry.

   

  

  5. Other Auxiliary Application Scenarios

  • Advanced treatment of municipal wastewater: Used for the pretreatment of effluent reuse in municipal wastewater treatment plants, removing indicators such as suspended solids and COD in the wastewater to meet reuse standards (e.g., greening water, road cleaning water, landscape water), realizing the recycling of water resources;
  •  
  • Swimming pool circulating water treatment: Used for the purification of swimming pool water, removing suspended solids, bacteria, organic matter, etc. from the water, keeping the swimming pool water clear and transparent, reducing the breeding of bacteria, meeting the swimming pool water quality standards, and reducing the usage of disinfectants.
  •  
  • Industrial clean water preparation: Used for the production of process clean water in industries such as electronics, chemical engineering, pharmaceuticals, and electroplating. It removes impurities, heavy metal ions, etc., from raw water to meet the purity requirements of industrial production water and prevent impurities from affecting product quality.
  •  
  • Emergency water supply purification: Used for emergency water supply purification after natural disasters such as floods and earthquakes. It quickly treats contaminated surface water and groundwater, removes impurities, reduces turbidity, ensures the safety of emergency drinking water, and features convenient operation and rapid effectiveness.

   

  

  

  V. Technical Parameters and Quality Standards

  This product strictly implements the national mandatory standard: GB 15892-2020 *Polyaluminium Chloride for Drinking Water Treatment*. All technical indicators comply with the requirements of this standard without any excessive items. The detailed technical parameters (typical indicators) of solid drinking-water grade PAC are listed below. Products with different specifications can be customized according to customer requirements (such as high-purity white PAC and products with different particle sizes).

  (I) Technical Parameters of Solid Drinking Water Grade PAC (Typical Indicators)

  Item	Indicator Requirements (GB 15892-2020)	Typical Test Values	Test Method
  Mass fraction of aluminum oxide (Al₂O₃) / %	≥29.0	29.5-30.5	GB/T 15892-2020 Appendix A
  Basicity / %	40.0～90.0	60.0-80.0 (adjustable)	GB/T 15892-2020 Appendix B
  Mass fraction of water insoluble matter / %	≤0.3	0.1-0.2	GB/T 15892-2020 Appendix C
  pH (10 g/L aqueous solution)	3.5～5.0	4.0-4.5	GB/T 15892-2020 Appendix D
  Mass fraction of lead (Pb) / mg/kg	≤5.0	≤2.0	GB/T 15892-2020 Appendix E
  Mass fraction of cadmium (Cd) / mg/kg	≤0.5	≤0.2	GB/T 15892-2020 Appendix E
  Mass fraction of arsenic (As) / mg/kg	≤0.5	≤0.1	GB/T 15892-2020 Appendix E
  Mass fraction of mercury (Hg) / mg/kg	≤0.05	≤0.02	GB/T 15892-2020 Appendix E
  Mass fraction of chromium (Cr) / mg/kg	≤5.0	≤2.0	GB/T 15892-2020 Appendix E
  Particle Size (Mesh)	80-120 (customizable)	80-100 (Regular)	Standard Sieving Method
  Moisture mass fraction / %	≤10.0	5.0-8.0	GB/T 15892-2020 Appendix F

  (II) Explanation of Quality Standards

  1. This product is produced and tested in strict accordance with GB 15892-2020 *Polyaluminium Chloride for Drinking Water Treatment*. Each batch undergoes factory inspection with a test report attached, and is only released to the market after ensuring qualified product quality.

  
  

  2. The inspection report includes information such as product name, specification, production batch, inspection date, test results of various indicators, and inspection conclusion, and can be provided to customers for acceptance and filing purposes.

  
  

  3. If customers have special quality requirements (such as higher purity, lower heavy metal content, and specific particle size), they may communicate in advance to customize products that meet their needs. Customized products shall still comply with relevant national standards for drinking water treatment agents;

  
  

  4. The product has a 12-month quality warranty period (under sealed and dry storage conditions). If quality problems occur within the warranty period (such as severe caking or failure to meet purity standards), you may contact after-sales service with the inspection report for resolution.

  VI. Product Packaging Specifications and Storage & Transportation Requirements

  (I) Packaging Specifications

  Solid drinking water-grade PAC is packaged in sealed packaging, which is moisture-proof, leak-proof, and convenient for storage and transportation. The conventional packaging specifications are as follows, and customized packaging is available according to customer requirements:

  
  

  • Conventional packaging: 25kg per bag, adopting double-layer packaging (inner layer is food-grade polyethylene plastic bag, outer layer is laminated woven bag). The packaging is tightly sealed, moisture-proof and damage-resistant. The bag is printed with information including product name, specification, production date, shelf life, manufacturer and warning labels.
  • 
    
  • Customized packaging: 50kg per bag, 1000kg per ton bag; the inner layer is a food-grade polyethylene plastic bag, and the outer layer is a high-strength woven bag or ton bag, suitable for large-scale transportation and storage.
  • 
    
  • Packaging Labeling: Each bag is clearly labeled with markings such as "Drinking Water Grade", "Food-Grade Raw Materials", "Moisture-Proof, Sun-Proof, Keep Away from Fire", to clearly distinguish it from industrial-grade products and prevent misuse.

  
  

  

  II. Storage Requirements

  • Storage conditions: The product should be stored in a dry, well-ventilated, cool and clean warehouse, away from dampness, rain and direct sunlight. The warehouse temperature shall be controlled at 5-30℃ to avoid changes in product performance caused by high or low temperatures.
  • 
    
  • Stacking requirements: Products shall be stacked neatly and kept off the ground (wooden boards or pallets can be used for padding) to avoid contact with damp ground. The stacking height shall not exceed 10 layers to prevent the bottom packaging from being damaged or caking under pressure.
  • 
    
  • Moisture-proof measures: The warehouse shall be properly moisture-proofed to prevent the product from absorbing moisture and caking. If the product accidentally becomes damp and caked, it can be crushed and dissolved before use without affecting the flocculation effect.
  • 
    
  • Isolation requirements: During storage, keep separate from alkalis, oxidizers, toxic and harmful substances to avoid product deterioration or potential safety hazards caused by mixed storage.
  • 
    
  • Shelf life: Under sealed storage conditions, the shelf life is 12 months. After the expiration date, all indicators shall be re-tested, and the product can only be used after passing the inspection.

  (III) Transportation Requirements

  • Means of transport: Closed transport vehicles (such as box trucks) shall be used to avoid exposure to rain, moisture and direct sunlight during transportation. The vehicles shall be clean, odor-free and free of residual toxic and harmful substances.
  • 
    
  • Handling Requirements: Handle with care during loading to avoid packaging damage and leakage; stack neatly to prevent squeezing and product caking.
  • 
    
  • Transportation Environment: High temperature, direct exposure to sunlight and rain should be avoided during transportation. Prevent freezing in winter and avoid high temperature in summer (temperature not exceeding 40℃) to ensure stable product performance.
  • 
    
  • Transportation taboos: It is strictly prohibited to transport together with alkalis, oxidizing agents, toxic and harmful substances to avoid chemical reactions that may cause product deterioration or safety accidents.
  • 
    
  • Handling Requirements: Handling personnel shall wear protective equipment (gloves, masks), avoid direct contact with the product, wash hands promptly after handling, and eating and drinking are strictly prohibited.

  • VII. Product Usage Methods and Precautions

    (I) Usage Method

    Solid drinking water-grade PAC must first be dissolved into an aqueous solution before dosing. The specific steps are as follows and can be flexibly adjusted according to the turbidity and volume of raw water:

    
    

    1. Dissolution Preparation: Prepare a clean dissolution tank (made of plastic, ceramic or stainless steel; iron containers shall be avoided) and add an appropriate amount of clean water (ordinary tap water at room temperature is acceptable, no heating required);
    2. 
       
    3. Dissolution operation: Slowly add solid PAC into the dissolution tank at a mass ratio of "solid PAC:clean water = 1:10 to 1:20", while stirring at a speed of 100-200 r/min for 3-5 minutes until completely dissolved, forming a pale yellow transparent aqueous solution.
    4. 
       
    5. Dilution and Dosing: Add the dissolved PAC aqueous solution slowly into the raw water purification equipment (sedimentation tanks, reaction tanks) at a ratio of "diluent solution: raw water = 1:50 to 1:100", while stirring continuously to ensure thorough mixing of the reagent with raw water, allowing flocs to form and then settle.
    6. 
       
    7. Dosage Adjustment: The conventional dosage is 10-50mg/L (i.e., 10-50g of solid PAC per cubic meter of raw water). The higher the turbidity of the raw water, the appropriately higher the dosage can be. For low-temperature and low-turbidity water, the dosage can be increased appropriately. It is recommended to conduct a laboratory test first to determine the optimal dosage before large-scale application.
    8. 
       
    9. Subsequent treatment: After dosing the chemicals, qualified drinking water can be obtained through flocculation, sedimentation, filtration and other processes. The sludge produced after filtration can be treated in accordance with conventional sludge treatment methods.

    
    

    

    (II) Precautions

    • Operation Protection: During dissolution and dosing, operators shall wear protective equipment such as gloves, masks, and goggles to avoid direct contact with the product. In case of accidental contact with the skin or eyes, rinse immediately with plenty of clean water for more than 15 minutes. If discomfort occurs, seek medical attention promptly.
    • 
      
    • Dissolution Taboos: Use clean water for dissolution. Alkaline water or water containing impurities is strictly prohibited to avoid affecting the flocculation effect. Do not add solid PAC directly into raw water, as undissolved solid PAC will impair water purification and may cause pipe blockage.
    • 
      
    • Dosage Taboos: Add slowly and evenly with stirring to prevent excessively high local chemical concentration, which may result in fine flocs and slow sedimentation. Strictly avoid mixing with other flocculants or disinfectants. If multiple chemicals are required, allow an interval of at least 30 minutes between dosages.
    • 
      
    • Equipment Cleaning: Dissolution tanks and dosing equipment should be cleaned regularly to prevent chemical residue from caking and affecting subsequent use. Equipment in contact with chemicals should be inspected periodically to avoid corrosion.
    • 
      
    • Safety Precautions: This product is an inorganic strong acid flocculant. Eating or drinking is strictly prohibited, and it must be stored out of the reach of children. In case of accidental ingestion, immediately drink plenty of warm water to induce vomiting and seek medical attention promptly.
    • 
      
    • Pilot Test Requirements: For first-time use or when the quality of raw water changes, a pilot test shall be conducted first (take a small amount of raw water, add PAC solution at different dosages, and observe the flocculation and sedimentation effects). After determining the optimal dosage, large-scale dosing may be carried out to avoid chemical waste or poor water purification effects.
    • 
      
    • Emergency Handling: In case of packaging damage or product leakage, the leaked product shall be collected promptly to avoid contamination of water sources and soil. The collected product can be dissolved and used normally. If the leakage volume is large, clean-up shall be carried out after taking protective measures to prevent environmental pollution.

    • VIII. Product Advantages and After-Sales Support

      (I) Product Advantages

      • Quality Assurance: Made with food-grade raw materials, produced in strict accordance with national standards, each batch of products is tested, featuring high purity, low impurities, and being safe and reliable;
      • 
        
      • Stable effect: Strong flocculation effect, fast sedimentation speed, adaptable to different water qualities and seasons, with stable water purification effect, and the treated water quality meets drinking water standards.
      • 
        
      • Controllable cost: low dosage, low sludge production, reduced costs for chemical usage and sludge treatment, and high cost-effectiveness for long-term use;
      • 
        
      • Easy to operate: The solid form is convenient for storage, transportation and measurement. The dissolution and dosing processes are simple, requiring no professional equipment, and suitable for various water supply scenarios.
      • 
        
      • Safety and environmental protection: Low corrosiveness, friendly to equipment and the environment, no residual harmful substances after treatment, and compliant with environmental protection requirements.

      (II) After-sales Support

      • Inspection Assurance: Each batch of products is accompanied by an inspection report to ensure qualified product quality. Third-party inspection services are available upon request.
      • 
        
      • Technical Support: Provide professional technical guidance, assist customers in determining the optimal dosage, dissolution and dosing schemes, and solve problems encountered during use;
      • 
        
      • Quality and After-sales Service: If any product quality issues arise within the warranty period, products can be returned or exchanged after inspection and confirmation to protect customers' rights and interests.
      • 
        
      • Customization Service: Products with different purity levels, particle sizes and packaging specifications can be customized according to customer needs to meet personalized requirements;
      • 
        
      • Logistics Support: Professional sealed transport vehicles are used to ensure that products are protected from moisture and damage during transportation and delivered to the customer's designated location on time.