High-Capacity Shallow Sand Filter for Industrial Water Treatment

The shallow sand filter is a highly efficient pressure-driven water treatment device designed for continuous, large-flow solid-liquid separation, serving as a core purification solution for diverse water treatment scenarios. 

Built with one or more standardized high-speed filter tanks, it adopts a thin-layer optimized filter medium (mainly high-quality quartz sand, with optional activated carbon or anthracite for targeted purification) and is equipped with professional water distributors, collectors and automatic control valves. Unlike traditional deep-bed sand filters, it features a compact shallow filter layer structure that delivers exceptional filtration performance while minimizing space occupation and operational costs. This equipment efficiently removes suspended solids, colloids, algae, sediment, rust and other impurities from water, stabilizes effluent quality, and supports fully automatic operation with uninterrupted water supply during backwashing, making it ideal for industrial, municipal, agricultural and commercial water purification demands.

Technical Features

High-Efficiency Shallow Filter Layer: The filter layer thickness is only 50-300mm (far thinner than 1-2m of traditional sand filters), with scientifically graded filter media to ensure uniform water distribution and thorough impurity interception. It achieves a filtration rate of 10-60m/h, 2-3 times higher than conventional filters, with effluent turbidity controllable below 0.5-5NTU and impurity removal efficiency exceeding 80%.

Intelligent Automatic Backwashing: Equipped with differential pressure/time dual-control PLC system, it automatically triggers backwashing according to dirt accumulation or preset timing, without manual operation. Backwashing is completed in 3-5 minutes per tank, with single-tank alternate backwashing to avoid system shutdown and maintain continuous water supply.

Compact Modular Design: Available in vertical and horizontal models, with a wide range of tank sizes (16-96 inches) to meet different flow requirements. The modular structure allows flexible single-unit or multi-unit parallel installation, adapting to limited on-site space and supporting outdoor installation without additional pump houses.

Corrosion-Resistant & Durable Construction: Made of high-strength FRP, stainless steel or carbon steel with anti-corrosion coating, the tank body has excellent acid and alkali resistance, adapting to various water quality environments and ensuring a service life of over 10 years.

Low Backwashing Consumption: Optimized hydraulic design reduces backwashing water and energy consumption significantly; backwashing water consumption is only 1/3 of traditional sand filters, eliminating the need for a dedicated backwash pump in most cases to cut energy costs.

Core Advantages

Superior Filtration Efficiency & Stable Performance: The shallow filter layer avoids clogging and channeling issues common in deep-bed filters, delivering consistent effluent quality even with fluctuating influent turbidity. It handles high impurity loads stably, meeting strict water quality standards for various applications.

Uninterrupted Operation & High Compatibility: Alternate tank backwashing ensures 24/7 continuous water supply, avoiding production downtime caused by filter maintenance. It is compatible with neutral, acidic and alkaline water bodies, supporting flexible integration into existing water treatment systems.

Ultra-Low Operational & Maintenance Costs: Fully automatic operation reduces labor input drastically; core filter media (quartz sand) has a service life of 3-5 years without frequent replacement, and routine maintenance only requires 1-2 monthly inspections, cutting long-term operating expenses.

Space-Saving & Easy Installation: Compact structure reduces floor space by 60% compared to traditional rapid filters, with simple pipeline connection and commissioning, suitable for both new construction projects and retrofits of existing water treatment systems.

Customizable & Scalable Capacity: We provide customized solutions based on customer flow, water quality and site conditions, and multi-unit parallel installation enables unlimited expansion of processing capacity to meet large-scale water treatment demands.

Application Fields

Our shallow sand filter is widely applied in multiple industries requiring efficient water purification, covering the following core scenarios:

Industrial Circulating Water Treatment: Cooling water purification for power plants, petrochemical, metallurgical, textile and printing & dyeing industries, reducing pipeline scaling and equipment corrosion, extending equipment service life.

Municipal Water Engineering: Tap water pretreatment, reclaimed water reuse, urban landscape water purification and sewage plant effluent polishing, improving water recycling rate and reducing environmental pressure.

Agricultural & Aquaculture Water: Irrigation water filtration for farmland, greenhouse and nursery, aquaculture water purification, removing impurities to protect irrigation equipment and improve aquaculture survival rate.

Commercial & Recreational Water: Circulation filtration for swimming pools, water parks, hot springs and artificial lakes, keeping water clear and reducing disinfection dosage.

Pretreatment for Advanced Water Treatment: Pre-filtration for reverse osmosis (RO), ultrafiltration (UF) and seawater desalination systems, reducing membrane fouling and extending membrane service life.

Food & Beverage Industry: Process water purification for food processing, beverage production, ensuring effluent quality meets food-grade safety standards.

Frequently Asked Questions

1. What is the filtration accuracy of the shallow sand filter, and what impurities can it remove?

Our standard shallow sand filter achieves a filtration accuracy of 0.1mm or lower, effectively removing suspended solids, sediment, rust, algae, colloids and other particulate impurities in water. For higher precision demands, we can customize filter media grading to meet stricter purification requirements.

2. How often does the filter media need to be replaced, and what is the routine maintenance workload?

The high-quality quartz sand filter media has a service life of 3-5 years under normal operating conditions, and only needs replacement when wear or pollution affects filtration efficiency. Routine maintenance is extremely simple: just 1-2 regular inspections per month, with no daily manual operation required due to the fully automatic control system.

3. How much floor space does the equipment occupy, and is it suitable for outdoor installation?

The shallow sand filter features a highly compact structure, with 60% less floor space than traditional sand filters. It supports outdoor installation directly without building a dedicated pump house, and we also offer vertical/horizontal models and layered installation solutions to fit limited on-site space.

4. Can the equipment adapt to different water quality conditions, such as high-turbidity or acidic/alkaline water?

Yes, it has strong water quality adaptability. It operates stably for influent turbidity below 50NTU, and the corrosion-resistant tank material adapts to neutral, weakly acidic and weakly alkaline water bodies. For extreme water quality, we can customize filter media and tank materials to ensure stable performance.

5. How about the energy and water consumption of the equipment during operation?

The equipment is designed for energy and water saving: alternate single-tank backwashing avoids high-power continuous operation, and no dedicated backwash pump is needed in most configurations. Backwashing water consumption is only 1/3 of traditional sand filters, greatly reducing daily operating costs for water and electricity.

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