Multi-Tank Sand Media Filter for Large-Scale Irrigation

Overview of Multi-Tank Sand Media Filter

This sand media filter system provides depth filtration for agricultural irrigation applications, removing suspended solids, algae, and organic matter from water sources. It uses graded sand media layers to trap particles throughout the filter bed, rather than only on the surface. The system supports flow rates from 30 m³/h to 270 m³/h, with options for manual or automatic backwash. Tanks and pipelines feature electrostatic powder coating on both interior and exterior surfaces for resistance to sewage erosion and UV radiation, suitable for permanent outdoor installation.

Complete Technical Specifications

Model Specifications

Dimensional Specifications (mm)

General Specifications

Customization Options

Features of Sand Media Filter Core Design

Scalable Multi-Tank Configurations

Systems are available in 2-tank and 3-tank configurations with tank diameters ranging from 600 mm to 1200 mm. Multiple units can be combined in parallel for higher flow rates, or installed in series with screen and disc filters for multi-stage filtration. Custom tank quantities and flow specifications are available upon request.

Three-Layer Graded Sand Media

The recommended filtration bed consists of three distinct sand layers: fine sand (top), medium sand (middle), and coarse sand (bottom). This design increases dirt-holding capacity and extends time between backwash cycles. The coarse sand layer acts as a support structure and provides final water polishing.

Uniform Water Distribution System

A double-layer water separation plate distributes water evenly across the entire sand surface, preventing channeling and localized erosion of the filter bed. This ensures all media is utilized consistently during operation.

Socket-Type Filter Caps

Precision-engineered socket-type filter caps are evenly distributed across the collection system, allowing filtered water to flow without restriction. This design minimizes pressure loss across the system.

Industrial Applications of Sand Filtration Systems

These filters serve as primary filtration for large agricultural irrigation projects drawing from rivers, canals, or reservoirs with high sediment loads. When used as pre-filtration ahead of screen or disc filters, they reduce the frequency of downstream equipment cleaning. Additional applications include greenhouse complexes, surface water treatment systems, agricultural processing facilities, and remote installations without shelter.

Installation & Maintenance Guidance

Basic Installation Steps

Prepare a level concrete foundation capable of supporting the filled weight of the system.

Position tanks vertically and align manifold connections for multi-tank systems.

Connect inlet and outlet pipelines using flange gaskets.

Load media in order: coarse sand first, followed by medium and fine sand, with partial water filling before each layer.

Backwash and rinse media thoroughly before initial operation.

Maintenance Requirements

Monitor pressure differential daily; backwash when pressure drop increases by 0.5-1.0 bar from clean condition.

Inspect connections for leaks and verify backwash operation regularly.

Replace sand media every 3-5 years, depending on water quality.

Perform annual inspection of tank coating, filter caps, and valve operations.

FAQ About Multi-Tank Sand Media Filter

How does a sand media filter work?

Water enters the top of the tank and passes through graded sand layers. Particles are trapped throughout the depth of the media bed. Filtered water collects through socket-type filter caps at the bottom and exits the system. Backwashing reverses flow to fluidize the bed and release trapped particles.

What is the benefit of three-layer sand media?

Three-layer grading provides depth filtration, trapping particles throughout the bed rather than only on the surface. This increases dirt-holding capacity and extends time between backwash cycles.

Can these filters be used alone or with other systems?

Sand filters can operate as standalone systems for many applications. They are also commonly installed as primary filtration ahead of screen or disc filters to improve overall system performance.

How long does sand media last?

With proper operation and backwashing, sand media typically lasts 3-5 years. Replace media when filtration performance degrades or channeling occurs.