A Complete Guide to Water Treatment Filtration Technology

Overview:

Industrial production, municipal water supply, and various circulation systems all depend on water. Impurities, sediments, suspended solids, and colloidal pollutants in the water can easily cause pipe blockages, equipment wear, and membrane element damage, greatly increasing operation and maintenance costs. LEFILTER has been deeply engaged in the water treatment filtration field for many years, and with its exquisite and rigorous manufacturing standards, has developed a complete range of water treatment filtration equipment covering coarse filtration, fine filtration, and deep purification. These systems are suitable for a variety of applications, including chemical plants, power plants, municipal water supply, wastewater treatment, swimming pool circulation, and farmland irrigation. This article will help readers understand the functions, advantages, and applicable scenarios of water treatment filtration equipment.

Fully Automatic Self-Cleaning Filter ------ continuous online operation, first choice for coarse pipeline filtration

The machine uses a stainless steel pressure tank and is equipped with an electrically controlled fully automatic brushing/suction cleaning system, 

featuring dual self-control modes for pressure differential and time. During normal water filtration, the filter traps large particles such as rust, fibers, 

and sediment; when the filter differential exceeds the set limit or the preset time is reached, the equipment automatically initiates cleaning, filtration, 

and drainage functions, without the need to shut down the system or interrupt the water supply.

Core Strengths:

• Fully automated operation and maintenance, requiring no on-site personnel, suitable for 24-hour continuous water supply; 

• Strong pressure resistance, withstanding high and low temperatures, compatible with industrial circulating water, central air conditioning cooling 

water, and pre-filtration of fire-fighting water; 

• Compact design, easy flange connection, can be quickly installed during old pipeline retrofits.

Applicable situations:

Circulating water in power plants, central air conditioning systems, steel industry circulating cooling water, municipal water distribution networks, 

and pre-protection for water supply in large buildings.

Multi-media filter ------ layered filler, removes suspended solids and colloids

The tank is filled with multiple layers of filter media such as quartz sand, anthracite, manganese sand, and activated carbon, achieving graded 

retention through different particle size layers. Water flows from top to bottom through the filter layers, trapping sediments, colloids, rust, and part 

of the color and turbidity in the water; periodically, air-water combined backwashing is used to remove the impurities retained in the filter media 

and restore the filtration flow rate.

Core Strengths:

• The filter media can be replaced flexibly. 

• In addition to regular water purification, filling with manganese sand can remove iron and manganese, and filling with activated carbon can adsorb 

residual chlorine and odors; 

• The tank is corrosion-resistant and durable, and the fully automatic valve group allows for unmanned backwashing, suitable for high-flow 

pretreatment.

Applicable situations:

Pretreatment for pure water RO reverse osmosis, purification of well and groundwater, swimming pool water circulation, bathing water purification, 

and industrial greywater recycling.

Shallow Sand Filter ------ modular cluster, specifically for high-flow circulating water

Multi-tank modular integrated design, with tanks filled with homogeneous fine sand, featuring short filtration paths and faster flow rates. The 

complete set of equipment integrates piping, automatic valves, and control cabinets, and can be used as a single unit or with multiple tanks in 

parallel. Internal backwashing requires minimal water; during backwashing, each tank is rinsed sequentially while the other tanks continue supplying 

water, ensuring continuous system flow.

Core Strengths:

• Occupies far less space than traditional sand filter tanks, with a higher upper limit of treatment flow; 

• Modular and expandable, adding tanks later is simple; 

• Resistant to high-turbidity influent and strong in shock load capacity.

Applicable situations:

Landscape water circulation, industrial circulating cooling water, central air conditioning systems, municipal sewage deep treatment, aquaculture 

water purification.

Safety/Bag Filter ------ precision control at the terminal, protecting delicate equipment

Stainless steel bag-type security filters and cartridge-type security filters use filter bags or water filter cartridges for terminal fine filtration, offering a 

wide range of filtration accuracy (1μm~200μm selectable). After water passes through the front-end coarse filter, it enters the bag-type security filter, 

capturing fine particles and debris, thereby protecting precision components such as reverse osmosis membranes, heat exchangers, nozzles, and 

metering pumps.

Core Strengths:

• Replacing filter elements and consumables is simple, with low maintenance requirements; 

• Pressure-resistant and corrosion-resistant, the food-grade stainless steel material is suitable for drinking water and water used in food processing; 

• Offers a wide range of precision options to meet refined water purification needs.

Applicable situations:

End-point protection for pure water systems, filtration of chemical solutions, purified water for edible oils and beverages, fine filtration of swimming 

pool water, and protection for boiler feed water.

Manual back-flush filter ------ simple and efficient, economical model for small and medium pipelines

Vertical carbon steel anti-corrosion tank, paired with a manual drain valve, relies on forward water flow for filtration and reverse water flow to wash 

away debris from the filter screen. The structure is extremely simple, with a very low failure rate, no complex electrical control components, and 

remains stable and durable under basic outdoor conditions.

Core Strengths:

• No electricity required, resistant to harsh environments, frost- and corrosion-proof; 

• Easy to operate, workers can perform backwashing with a single switch; 

• The most cost-effective solution for low-flow pipelines.

Applicable situations:

Rural well water supply, small HVAC piping, irrigation pipelines, and simple water purification for small factories.

Integrated Water Purifier ------ one-stop complete water purification solution, hassle-free water supply for villages and towns

A fully assembled water treatment unit integrating flocculation, sedimentation, filtration, and disinfection, skid-mounted and ready for operation by 

simply connecting water and electricity. Designed for high-turbidity surface water, river water, and reservoir water, it provides comprehensive 

purification of silt, algae, suspended solids, and microorganisms, producing water that meets drinking water standards.

Core Strengths:

• Modular integration with minimal civil construction; 

• Fully automatic operation, suitable for remote villages and towns with limited professional maintenance personnel; 

• Dosing and UV sterilization modules can be added as needed.

Applicable situations:

Centralized water supply in rural areas, township water plants, purification of surface water in mountainous areas, temporary domestic water supply 

for construction sites.

Model selection ------ Match according to water quality levels to maximize water purification efficiency.

A complete water treatment approach recommending staged filtration, easing the load step by step, and prolonging the lifespan of downstream 

equipment:

Main pipeline inflow:

Use a self-cleaning filter/backwash filter as the first coarse filter to intercept large impurities;

Need to clarify and remove iron and manganese:

Used with multi-media filters/shallow sand filters to deeply remove colloids and sediment;

Purified water and ultrapure water endpoints:

Install a safety bag filter for precise control;

Direct supply of surface water and rivers in towns and villages:

Directly choose integrated water purification equipment for one-stop treatment.

LEFILTER has consistently promoted the development of the water treatment industry with robust craftsmanship. By employing simple and reliable 

equipment designs, it minimizes users' operational and maintenance hassles while offering a full range of products to meet the diverse water 

purification needs across various sectors. Whether it is large-scale industrial water circulation, drinking water for villages and towns, precise 

chemical water treatment, or residential HVAC water purification, our water treatment and filtration equipment can be customized in size and 

automation to suit the needs of every water treatment requirement.