China Suppliers Multi-Media Sand and Gravel Water Filter for Efficient Irrigation Systems - Factory Direct Quality
How it works
The multi-media filter filters through the layers of different filter materials to achieve the step-by-step removal of impurities in water:
Water flow from top to bottom or from bottom to top through the multi-layer filter material, large particles of impurities are first intercepted by the upper filter material, small particles of impurities are captured by the lower filter material.
The gaps between the layers of the filter material form complex filtration channels that can capture smaller particles.
Composition of filter material
The filter material of a multi-media filter is usually composed of the following materials, arranged in layers from large to small by density and particle size:
- Support the upper filter material to prevent the loss of filter material.
- Distribute water evenly to avoid bias.
- Filter large suspended particles.
- Filter suspended matter, sediment, colloids and other medium particle impurities in water.
- Protect the upper fine filter material and extend its service life.
- Filter smaller suspended matter and some organic matter.
- Due to its light density, the upper layer improves filtration efficiency.
- Adsorption of residual chlorine, organic matter, odor, chroma and so on.
- Improve the taste and smell of water.
Strengths
Application Scenarios
Design essentials
Multi-media filter vs activated carbon filter
| Features | Multi-media filter | Activated carbon filter |
|---|---|---|
| Key features | Removal of suspended solids, silt, colloids, etc | Adsorption of residual chlorine, organic matter, odor, etc |
| Filter material composition | Gravel, quartz sand, anthracite, etc | Activated charcoal |
| Application scenarios | Pretreatment, industrial water treatment, municipal water supply | Drinking water treatment, odor removal |
| Maintenance methods | Backwash and replace the filter material regularly | Back rinse and replace the activated carbon regularly |
Sum up
Frequently Asked Questions
What is the main purpose of a multi-media filter?
The main purpose of a multi-media filter is to remove suspended solids, silt, colloids, and other particulate impurities from water. It is widely used as a pretreatment step in municipal, industrial, and household water treatment systems.
How often should the filter media be backwashed?
Backwashing frequency depends on water quality and system design. Typically, it is performed when the pressure differential across the filter reaches a set limit (usually 0.05-0.1 MPa) or on a regular timed schedule (e.g., every 24 to 72 hours).
What is the typical lifespan of the filter media?
Under proper operating conditions and regular backwashing, the physical filter media (such as quartz sand, gravel, and anthracite) can last between 3 to 5 years before requiring replacement.
Why is anthracite placed at the top layer if it has larger particle sizes?
Anthracite has a lower density than quartz sand and gravel. Placing it at the top allows larger particles to be intercepted first without clogging the lower, denser sand layer, optimizing the depth filtration capability of the system.
Can a multi-media filter remove dissolved chemicals and odors?
No, standard multi-media filters only remove physical suspended solids. For chemical adsorption, color, odor, and residual chlorine removal, an activated carbon filter layer or a standalone activated carbon filter must be used.
What flow rate is recommended for optimal filtration?
The design filtration flow rate is typically controlled between 8-12 m/h. Exceeding this range may force impurities through the filter media gaps, significantly reducing the overall filtration efficiency.