LFQ Series Shallow Sand Filter for Industrial Water Treatment
Introduction:The shallow sand filter is a high-speed media filtration solution widely adopted for circulating water, raw water and irrigation purification. It works perfectly with water filter housing and automatic backwashing control systems to efficiently capture suspended solids and reduce turbidity. Modular unit design allows parallel expansion to meet large-flow treatment demands across steel, power, petrochemical and aquaculture industries.
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Product Introduction
The LFQ series shallow sand filter, equipped with sturdy water filter housing, functions as a reliable self-cleaning filter for medium and large-scale water purification. It consists of one or multiple standard high-speed filtration units. Water flows through the internal water distributor and water collector, removing particulate pollutants and lowering water turbidity effectively. When fitted with customized filter media such as activated carbon or anthracite, it can further adsorb organic compounds and ions in water. Filtration units cover sizes from 16 inch (400mm) up to 96 inch (2400mm), supporting flexible installation layouts. It can run as an independent filtration set with existing water supply pumps, or be equipped with a dedicated pump as a side-stream filter. Multiple filter units can be installed on shared pipe manifolds to expand the overall treatment capacity without limits. Three backwash modes are available: manual, semi-automatic and fully automatic. Operators can trigger backwashing via manual buttons, PLC, differential pressure signal or management platform. Both backwash cycle and duration are adjustable; the factory default backwash time is 3 minutes. It can be controlled by a DCS automatic filtration system, or optional PLC control for centralized management and remote communication.
Working Principle
When the system is in filtration mode, pressurized raw water enters the water distribution system and spreads evenly across the filter media bed. Suspended solids are trapped by the sand layer, and filtered clean water is collected uniformly by the precision slotted collector at the tank bottom before flowing out of the filter. As contaminants accumulate inside the media bed, pressure loss gradually rises. Once the differential pressure hits the preset threshold or the scheduled cleaning time arrives, the system automatically switches to backwash status. Pressurized water flows reversely through the collector into the filter bed, scouring the sand media to dislodge trapped sludge and discharge wastewater out of the system. After a minimum 2-minute backwash cycle, the valves reset automatically and the unit returns to normal filtration.
Technical Specifications
| LEFILTER Model | Tank Size | Control Valve Size | Drain Port | Max Flow (Single Tank, m³/h) | Max Flow (2 Tanks, m³/h) | Max Flow (3 Tanks, m³/h) | Max Flow (4 Tanks, m³/h) | Max Flow (5 Tanks, m³/h) |
|---|---|---|---|---|---|---|---|---|
| LFQ-600 | Φ600*1550 | DN50 | DN50 | 15 | 30 | 45 | 60 | 75 |
| LFQ-800 | Φ800*1650 | DN80 | DN80 | 30 | 60 | 90 | 120 | 150 |
| LFQ-1000 | Φ1000*1750 | DN80 | DN80 | 45 | 90 | 135 | 180 | 225 |
| LFQ-1200 | Φ1200*1950 | DN100 | DN100 | 60 | 120 | 180 | 240 | 300 |
| LFQ-1400 | Φ1400*2150 | DN100 | DN100 | 70 | 140 | 210 | 280 | 350 |
| LFQ-1600 | Φ1600*2200 | DN100 | DN100 | 100 | 200 | 300 | 400 | 500 |
| LFQ-1800 | Φ1800*2250 | DN150 | DN100 | 120 | 240 | 360 | 480 | 600 |
| LFQ-2000 | Φ2000*2300 | DN150 | DN100 | 150 | 300 | 450 | 600 | 750 |
| LFQ-2200 | Φ2200*2300 | DN150 | DN100 | 200 | 400 | 600 | 800 | 1000 |
| LFQ-2400 | Φ2400*2300 | DN150 | DN100 | 230 | 460 | 690 | 920 | 1150 |
Core Advantages
Key core components adopt imported original parts for stable and reliable long-term operation.
Single-chamber filter element design delivers superior backwashing performance and greatly lowers sand leakage rate.
The water collector supports stainless steel or ABS material options to extend service life.
The water storage tank is arranged at the bottom of the unit, which reduces water resistance and simplifies inspection & maintenance work.
High filtration velocity with low pressure drop, solving the pain points of slow speed and limited flow capacity on conventional media filters.
Modular layout saves over 40% of floor space and cuts piping engineering workload by more than 50%, reducing overall investment cost.
Flexible backwash water source selection: internal system water, water tower water or external water supply, with automatic switching available for special requirements.
Wide size range from 16” to 96”, multi-tank parallel connection enables unrestricted flow scaling according to project demand.
Application Scenarios
Industrial process water filtration: water protection for heat exchangers and heat exchange stations.
Industrial circulating water filtration: widely used in steel, metallurgy, paper making, power, petrochemical, food processing and air conditioning systems.
Raw water pretreatment: surface water including river water, lake water and seawater purification.
Irrigation filtration: farmland, municipal garden and golf course water treatment.
Aquaculture, swimming pool and water park water filtration.
FAQ
Q1: Can multiple LFQ shallow sand filters work together?
A: Yes. The modular design supports multi-unit parallel installation on shared pipelines. You can combine 2 to 5 tanks to boost total flow easily.
Q2: How long is the backwash cycle of this shallow sand filter?
A: The backwash trigger condition can be differential pressure or preset timer. The factory default backwash duration is 3 minutes, adjustable on site.
Q3: What filter media can be filled inside the tank?
A: Quartz sand is the standard media. You can also choose activated carbon, anthracite as custom fillings for organic matter and ion removal.
Q4: Is the backwashing system automatic?
A: We supply three control types: manual, semi-automatic and fully automatic. Fully automatic version supports PLC/DCS remote control.
Q5: What materials are available for the internal water collector?
A: Two optional materials: stainless steel for heavy-duty corrosive water, and ABS for cost-effective clean water applications.
Related Products
Shallow Sand Filter LFQ-2400 Is for Agricultural Irrigation
Shallow Sand Filter LFQ-2000 for Urban Sewage Treatment
Shallow Sand Filter LFQ-1800 for Sewage Treatment Equipment
Shallow Sand Filter LFQ-1600 for Steel Mill Water Treatment
Shallow Sand Filter LFQ-1200 for River Water Filtration
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