GSL type high-speed filter

• Product Overview

The GSL-type high-speed filter is a high-efficiency, compact granular media filtration system developed by our company. Featuring an optimized deep-bed design and advanced backwashing technology, it delivers stable filtration rates while effectively removing suspended solids, colloidal particles, and turbidity from water. As a critical component in water treatment systems, this solution provides efficient purification for high-flow water applications.

• Structure and Working Principle

1. Core structural composition

The equipment is a vertical cylindrical pressure vessel with a highly integrated core system, primarily comprising:

• Tank body: The primary pressure-bearing structure, typically constructed with carbon steel lined with rubber for corrosion resistance, stainless steel, or fiberglass reinforced plastic (FRP), ensuring long-term operational reliability under pressure.
• High-efficiency filter bed: The core filtration layer, typically filled with strictly graded quartz sand, anthracite, or a combination of multiple media. The unique gradation and thicker filter layer design are intended to achieve effective depth filtration.
• Water distribution and collection system:

• Upper distributor: ensures uniform water distribution across the filter media surface to prevent uneven flow erosion.
• Bottom water collection/distribution device: Typically employs a porous plate system consisting of a dome plate and high-strength filter cap (or filter rod). It ensures uniform water collection during filtration and uniform water/gas distribution during backwashing.
  • Integrated backwash system: A multi-port valve assembly or pneumatic/electrical valve group that combines feedwater, effluent, backwash feedwater, backwash discharge, forward wash, and air vent functions, enabling rapid switching of operating modes. Supports an efficient air-water combined backwash mode.
  • Automatic control system (optional): The system automatically controls the entire filtration and backwashing process based on pressure differentials, time, or manual commands.

2. Working Principle

The device periodically operates in two states: filtration and backflushing.

• Filtration process: Under system pressure, raw water permeates downward through the filter media layer. Impurities in the water are progressively retained by the filter media via mechanical sieving and adsorption, while clean water is collected and discharged through the bottom water collection system.
• Backwashing process: When the filter layer reaches saturation and resistance (pressure difference) increases, the system switches to backwash mode. The procedure follows a sequence of air scouring followed by water rinsing. Air and water are forcefully injected from the bottom upward, causing the filter media to expand and tumble. This process dislodges retained contaminants, which are then flushed away with the backwash water, thereby restoring the filter's filtration capacity.
• Core technical features

1. Higher operating filtration rate: With optimized internal structure and filter media gradation, this filter model operates stably at filtration rates exceeding conventional filters, achieving higher water production per unit area, which facilitates equipment miniaturization.
2. The larger capacity and longer operation period of the filter bed are due to the deep filter bed and reasonable gradation, which can accommodate more impurities and prolong the filtration period and reduce the frequency of backwash.
3. Efficient backwashing design: The integrated valve system and recommended air-water combined backwashing method deliver superior cleaning performance, helping maintain the filter media's long-term cleanliness and filtration efficiency while keeping backwashing water consumption within optimal limits.
4. The operation management is relatively simple: the valve has a high integration level and the pipeline is simple. With the automatic control scheme, the operation steps can be greatly simplified, and the technical requirements for daily operation and maintenance are reduced.
5. The equipment features a compact design and flexible installation. As an integrated pressure vessel, it is easy to install on-site and adapts well to various site conditions. It is suitable for both new projects and the retrofitting of existing systems.

• Main technical parameters

• Typical Application Fields

This filter type is ideal for applications requiring high-efficiency, compact filtration solutions:

• Industrial circulating cooling water system: As the core equipment for bypass filtration or makeup water treatment, it reduces system turbidity, controls scaling and microbial proliferation.
• Pre-treatment process: As a critical safety filter, it removes suspended solids before advanced treatment processes such as reverse osmosis (RO), nanofiltration (NF), and ion exchange, protecting downstream equipment.
• Advanced wastewater treatment for reuse: The effluent from biochemical treatment undergoes filtration to further reduce suspended solids (SS) and turbidity, meeting reuse standards.
• Seawater desalination pretreatment: As one of the key pretreatment steps before reverse osmosis membranes.
• Municipal and building water supply: pretreatment or primary filtration unit for small and medium-sized water supply systems and direct drinking water systems.