Overview
LEFILTER Multi-media Filter (LF-SYS Series) is a classic mechanical pretreatment equipment for water treatment. Under a certain pressure, raw water flows downward through layered granular filter media, intercepting suspended solids, silt, colloid and other impurities to clarify the water. Common filter media include quartz sand, anthracite, manganese sand, which can be flexibly combined according to inlet water quality to realize turbidity removal, iron and manganese removal and sediment filtration.
This equipment is usually the first core filtration unit in the water treatment flow. It works together with activated carbon filter, precision filter and reverse osmosis system. Raw water passes through the multi-media filter first to remove most suspended pollutants, then enters subsequent purification units, effectively protecting ion exchange resin and RO membrane from particle contamination.
TheLF-SYS series covers a complete specification range from LF-SYS500 to LF-SYS3600, single tank flow from 2 m³/h up to 180 m³/h, design pressure 1.0MPa. It supports manual control and automatic timing control, with optional water washing or air-water combined backwashing modes. Tank material can be Q235B carbon steel with rubber lining, 304 or 316L stainless steel, and water cap is available in ABS, 304, 316L for different corrosive working conditions. It has been widely applied in steel mills, paper mills, petrochemical plants, power plants and chemical water treatment projects.
Applications
Raw water pretreatment: river water, lake water, reservoir water and well water to remove sediment and suspended particles
Reverse osmosis system pre-treatment: pre-filter for RO pure water production lines
Softening water system: lower turbidity and protect ion exchange resin
Industrial circulating water: steel mill clean ring water, paper mill circulating water, petrochemical cooling water
Underground water treatment: manganese sand filling for iron and manganese removal
Boiler make-up water, food & beverage process water, factory and community water supply projects
Features
Layered composite filter media structure, large dirt holding capacity and stable filtration performance.
Two backwashing modes optional: water washing, or air-water combined backwashing for better cleaning effect.
Diversified material selection for tank and water cap, adapting to different water quality and corrosion requirements.
Flexible control options: manual valve operation or automatic timing backwash control.
Wide flow range, compact layout, easy installation and low operation & maintenance cost.
Mature engineering application, many on-site project cases in power, chemical, papermaking and metallurgy industries.
Complete LF-SYS model specifications, customized design available for special working conditions. Multi-media Filter (LF-SYS Series) can be matched with skid-mounted pipeline and instrument assembly.
Filter principleFilter status
Raw water enters the tank from the top inlet, flows downward through multi-layer filter media. Suspended solids, silt and colloidal impurities are trapped inside the media bed. Clear water passes through the bottom water collector and flows out to the next water treatment unit. The filtration speed is controlled at 10-20m/h to guarantee stable outlet turbidity.
Backwash status
After long-term operation, impurities accumulate in the filter bed and cause inlet-outlet pressure difference rise. Backwash water flows upward from the tank bottom, fluidizing the filter media and scrubbing dirt off the media surface. Sewage is discharged from the top drain port. Air-water combined backwash can enhance the scrubbing effect. After backwashing, the filter bed settles, and the system returns to filtering mode.
Technical Parameters
| Parameter | Details |
|---|
| Inlet turbidity | ＜20FTU |
| Effluent turbidity | ＜3FTU |
| Working temperature | 5~60℃ |
| Working pressure | ≤0.6MPa |
| Inlet water pressure | ≥0.1MPa |
| Backwash inlet pressure | ≥0.3MPa |
| Pressure difference trigger range | 0.02~0.05MPa |
| Working method | Pressure type, water flows from top to bottom |
| Filtration speed | 10~20m/h |
| Backwash mode | Water washing, air-water combined backwashing |
| Backwash water consumption | ≤3% |
| Backwash intensity | 4~15L/s·m² |
| Backwash duration | 10~15min |
| Backwash expansion rate | 40~50% |
| Control mode | Manual control, automatic timing control |
| Tank material | Q235B, 304, 316L, carbon steel with rubber lining |
| Water cap material | ABS, 304, 316L |
| Single tank flow rate | 0.5~180m³/h |
| Input voltage | AC220V±10%, 50-60HZ |
| Output voltage | AC24V / AC220V |
| Load power | 24W/1A |
| Single circuit power | ≤50W |
Order Information
| Model | Tank size φ×H | Inlet&outlet | Max. Flow rate (t/h) | Design Pressure (MPa) |
|---|
| LF-SYS500 | φ500*1500 | DN50 | 2 | 1.0 |
| LF-SYS600 | φ600*1500 | DN50 | 3 | 1.0 |
| LF-SYS800 | φ800*1500 | DN65 | 5 | 1.0 |
| LF-SYS1000 | φ1000*1500 | DN65 | 8 | 1.0 |
| LF-SYS1200 | φ1200*1500 | DN65 | 12 | 1.0 |
| LF-SYS1500 | φ1500*1500 | DN80 | 18 | 1.0 |
| LF-SYS1600 | φ1600*1500 | DN80 | 20 | 1.0 |
| LF-SYS1800 | φ1800*1500 | DN100 | 25 | 1.0 |
| LF-SYS2000 | φ2000*1500 | DN100 | 30 | 1.0 |
| LF-SYS2200 | φ2200*1500 | DN125 | 40 | 1.0 |
| LF-SYS2400 | φ2400*1500 | DN125 | 50 | 1.0 |
| LF-SYS2500 | φ2500*1500 | DN125 | 60 | 1.0 |
| LF-SYS2600 | φ2600*1500 | DN150 | 70 | 1.0 |
| LF-SYS2800 | φ2800*1500 | DN150 | 80 | 1.0 |
| LF-SYS3000 | φ3000*1500 | DN219 | 100 | 1.0 |
| LF-SYS3200 | φ3200*1500 | DN219 | 120 | 1.0 |
| LF-SYS3400 | φ3400*1500 | DN250 | 150 | 1.0 |
| LF-SYS3600 | φ3600*1500 | DN250 | 180 | 1.0 |
Note: H is the height of the straight section of the cylinder.
FAQ
Q1: What filter media can be filled in this Multi-media Filter (LF-SYS Series)?
A1: Quartz sand is the standard medium for turbidity removal. Anthracite is matched with quartz sand for composite filtration. Manganese sand is available for underground water iron and manganese removal.
Q2: What is the difference between multi-media filter and shallow sand filter?
A2: Multi-media Filter is deep bed filter with low filtration speed, mainly used for RO pretreatment. The shallow sand filter runs at high speed, more suitable for large-flow circulating water and agricultural irrigation.
Q3: What backwash types can you provide?
A3: We support single water washing and air-water combined backwashing. Air-water combined backwash gets better cleaning effect for heavily polluted raw water.
Q4: Can it be used before reverse osmosis?
A4: Yes. It is widely used as pre-treatment equipment for RO systems, reducing inlet turbidity and protecting RO membrane.
Q5: Can you supply automatic control system?
A5: Yes. We can equip automatic valves and PLC control cabinet to realize automatic timing backwash without manual operation.
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