LEFILTER Multi-Media Filter: Multi-Layer Depth Filtration for Turbid Water—From Silt to Colloids, One Filter Solves It All

Introduction  

Turbid water—whether from rivers, wells, or industrial discharge—harbors a mix of impurities: large silt particles, fine clay, rust, algae, and even tiny colloids. These not only cloud water but also damage downstream equipment like reverse osmosis membranes, softeners, or boilers. LEFILTER Multi-Media Filter is engineered to tackle this with graded depth filtration: by stacking three layers of media (anthracite, quartz sand, garnet) with varying particle sizes and densities, it traps impurities from large to small in one pass.

Features

• ① Graded Media: "Big Particles First, Small Ones Later"

• Anthracite (top layer): 1.2–2.0 mm particle size, low density (1.4–1.6 g/cm³). Traps large suspended solids (5–50 μm) like algae and silt, with high dirt-holding capacity.

• Quartz sand (middle layer): 0.5–1.2 mm particle size, medium density (2.6–2.7 g/cm³). Captures fine particles (1–5 μm) such as clay and rust.

• Garnet/manganese sand (bottom layer): 0.2–0.5 mm particle size, high density (4.0–4.2 g/cm³). Removes colloids (<1 μm) and, with manganese sand, oxidizes iron/manganese ions (Fe²⁺→Fe³⁺).

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• ② Auto-Backwash: Self-Cleaning Without Downtime

• Trigger modes: Time-based (e.g., every 24 hours) or pressure difference-based (when inlet-outlet pressure >0.15 MPa).

• 3-step cleaning:

• Backwash: Reverse flow (10–15 L/m²·s) lifts media, flushing trapped impurities.

• Rinse: Forward flow (5–8 L/m²·s) settles media in original layers.

• Standby: Automatically returns to filtration mode, with <5 minutes of downtime.




• ③ Durable Construction: Built for Harsh Environments

• Tank material: Optional FRP (fiberglass-reinforced plastic, corrosion-resistant for acidic/alkaline water) or carbon steel with epoxy coating (for high-pressure industrial use).

• Internal components: 316 stainless steel distributor (resists rust) and PVC lateral pipes (smooth flow, no scaling).

• Service life: Media lasts 2–3 years; tank lifespan ≥10 years (tested in coastal high-salt environments).

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Technical Drawings

Technical Parameters

• Working effect

Influent turbidity:<20FTU, effluent turbidity:<3FTU

• Working Environment Parameters

Working temperature: 5-60°C

Working pressure:0.6MPa

Water inlet pressure: > 0.1MPa

Backwash water inlet pressure:>0.3 MPa

Pressure difference between inlet and outlet: 0.02-0.05MPa

•  Operating parameters

Working method: pressure type

Operating method: water flow from top to bottom

Filtration speed: 10-20m/h

Backwashing method: water washing, or air-water combined backwashing

Backwashing water consumption:3%

Backwashing intensity: 4-15L/s-m2

Backwash duration: 10-15min

Backwash expansion rate: 40-50%

• Control mode: manual control, automatic control (time control)

• Tank material:Q235B,304,316L, carbon stel with rubber lining.Water cap material:ABS,304,316L

• Single flow rate: 0.5m3/h~180m3/h

• Input voltage: AC22OV± 10 %50-60HZ

• Output voltage: AC24V/ AC220V

• Load power: 24W/1A

• Power of each circuit:<50w

Application Fields

① Municipal Water Supply: Protecting Public Health

• Challenge: River/lake water often contains algae, silt, and organic debris (turbidity 20–100 NTU), which clog pipes and affect disinfection.

• Solution: LeFilter filters reduce turbidity to <3 NTU, ensuring chlorine disinfection works efficiently (lowering trihalomethane formation by 40%).

• Case: A municipal water plant in Hubei cut filter maintenance costs by 60% after switching to layered media.

② Industrial RO Pre-Treatment: Extending Membrane Life

• Challenge: RO membranes are easily damaged by particles >5 μm, leading to frequent cleaning and replacement (costing ¥10,000+/year for small systems).

• Solution: Multi-media filtration as pre-treatment removes 95% of particles, reducing RO cleaning frequency from monthly to quarterly.

• Data: A electronics factory using LF-MF-1200 extended RO membrane life from 2 years to 3.5 years.

③ Swimming Pools & Aquariums: Crystal-Clear Water

• Challenge: Pool water accumulates skin cells, hair, and sunscreen residues, causing cloudiness and bacterial growth.

• Solution: LeFilter’s auto-backwash filter maintains turbidity <1 NTU, reducing chlorine use by 30% (safer for swimmers).

• User Feedback: A hotel pool reported 80% fewer guest complaints about "cloudy water" after installation.

④ Mining Wastewater: Recycling Resource

• Challenge: Mine drainage contains heavy metal particles (e.g., Fe, Zn) and silt, failing discharge standards (turbidity ≤20 NTU).

• Solution: Manganese sand in the filter oxidizes Fe²⁺ to Fe³⁺, while layered media removes particles, enabling water reuse for dust suppression.

• Result: A coal mine in Shanxi recycled 80% of wastewater, saving ¥200,000/year in fresh water costs.

Q&A: Your Concerns, Answered

Q1: How to choose media combinations?

A: For general turbidity: anthracite + quartz sand + garnet. For iron/manganese-rich water: replace garnet with manganese sand. For high organic content: add activated carbon in the top layer.

Q2: How often to replace media?

A: Anthracite: 2–3 years; quartz sand: 3–4 years; manganese sand: 1–2 years (faster depletion due to iron oxidation).

Q3: Can it handle high-temperature water?

A: Yes. FRP tanks tolerate 5–60℃; for >60℃, choose carbon steel tanks with high-temperature coating.

Q4: Is manual operation difficult?

A: Basic models have simple valve controls (3 steps: filter → backwash → rinse). For large systems, automatic PLC control is recommended (set and forget).