Multi-media Filtration (MMF)
Mit Water manufactures multi-media filtration systems as a cost-effective pre-treatment step for seawater and brackish water desalination. MMF removes suspended solids and reduces turbidity in raw seawater before it reaches downstream cartridge filters and RO membranes, extending filter life and protecting membrane elements from particulate fouling.
Working Principle
Raw seawater flows downward through a pressure vessel containing multiple layers of granular media. Coarse, lighter anthracite on top captures larger particles while finer, denser sand and garnet in lower layers remove progressively smaller particulates. After filtration, the water typically has turbidity below 1 NTU and SDI15 below 5, making it suitable for cartridge filter and RO feed.
System Features
Our MMF systems include epoxy-coated carbon steel or FRP pressure vessels, multi-layer filter media, automatic backwash valves, and PLC control. Inline coagulant dosing is provided to enhance filtration performance during high-turbidity events. Duplex or triplex configurations allow continuous operation during backwash cycles.
MMF is a reliable pre-treatment for seawater and other water sources:
- Seawater desalination pre-treatment (before cartridge filters)
- Brackish water RO pre-treatment
- Surface water treatment for drinking water production
- Industrial cooling water filtration
- Aquaculture intake water treatment
- Produced water treatment for oil and gas
Technical Parameters
| Flow Rate | 10 to 300 m3/h per vessel |
| Filtration Velocity | 8 to 15 m/h |
| Inlet Turbidity | Up to 30 NTU (seawater) |
| Outlet Turbidity | Below 1 NTU |
| Vessel Material | Epoxy-coated carbon steel or FRP |
| Media Layers | Anthracite, silica sand, garnet |
| SDI15 (after MMF) | Below 5 |
| Backwash Rate | 35 to 50 m/h |