Multi-media Filter Introduction
A multi-media filter is a pressure-type filtration device that forms a multi-layer filter bed with two or more filter materials such as quartz sand, anthracite, manganese sand and zeolite.
It is mainly used to remove sediment, rust, suspended solids, colloids, particles and turbidity impurities in water. Widely applied in the pretreatment of groundwater, tap water, surface water, circulating water and wastewater reuse, it serves as a front protection barrier for reverse osmosis, ultrafiltration, water softening and ion exchange equipment.
Featuring high filtration precision, large throughput, stable operation and automatic backwashing, it is the most basic and core pretreatment unit in water treatment systems.
Working Principle of Multi-media Filter
The multi-media filter adopts the principles of mechanical interception, gravity sedimentation and adsorption coagulation:
1. Layered filtration. The tank is filled with filter media of different specific gravity such as anthracite, quartz sand and magnetite, scientifically graded with light media on the upper layer and heavy media at the bottom.
2. Deep purification. Water flows downward through the filter layer; large impurities are trapped on the surface while fine suspended solids are adsorbed and intercepted in the deep layer.
3. Turbidity reduction and clarification. Effectively reduce water turbidity and suspended solids to produce clear effluent and protect downstream precision equipment.
4. Automatic backwashing. When the pressure difference reaches the set value, water flows in reverse to loosen filter media and discharge contaminants, restoring filtration capacity without manual cleaning.
Advantages of Multi-media Filter
1. Excellent filtration effect and clear effluent. Efficiently remove sediment, rust and suspended solids, with turbidity reduced below 1NTU.
2. Reasonable media gradation and hardly compacted. Multi-layer media matches with large dirt holding capacity, low filtration resistance and long operation cycle.
3. Fully automatic operation and maintenance-free. Automatic backwashing and Wastewater discharge, supporting 24-hour unattended operation.
4. Large flow rate and small footprint. Pressure-type design with large water treatment capacity and flexible installation, suitable for equipment rooms, outdoors and rooftops.
5. Extremely low operating cost. Only a small amount of water and power consumed; filter media service life reaches 3–5 years with almost no consumable replacement.
6. Sturdy and corrosion-resistant material. Optional anti-corrosion carbon steel, stainless steel 304 and FRP, adapting to various water qualities.
7. Protect downstream equipment. Effectively prevent RO membranes, ultrafiltration membranes, resin, pressure gauges and water pumps from blockage and wear.
8. Wide application range. Suitable for pretreatment of groundwater, surface water, river water, lake water, reclaimed water and circulating water.
Application Fields of Multi-media Filter
Groundwater / well water pretreatment (sediment and turbidity removal)
Front protection for RO reverse osmosis and ultrafiltration equipment
Pre-filtration for water softeners and ion exchangers
Waterworks, community water supply and rural safe drinking water projects
Filtration of circulating cooling water, air conditioning water and swimming pool water
Advanced filtration and reclaimed water reuse for Wastewater treatment plants
Process water pretreatment for food, beverage, chemical and metallurgical industries
Purification of landscape water, river water and reservoir water
Process Flow of Multi-media Filter
Multi-media Filter Process Flow Chart
Raw Water → Raw Water Pump → Multi-media Filter → Activated Carbon Filter → Precision Filter → RO / Softening / Ultrafiltration Equipment → Water Consumption Point
Core Process: Forward flow filtration (turbidity and impurity removal) → Operate until set pressure difference → Backwashing (drainage) → Forward washing up to standard → Resume operation
This article elaborates on the working principle, core advantages, application fields and standard process flow of multi-media filters, providing reference for your model selection and operation maintenance. To obtain quotation, technical parameters and successful cases suitable for your working conditions, you can consult the homepage of Xi'an DIEN Water Treatment Official Website. We will customize efficient and energy-saving water treatment solutions for you.
