To prevent this, multi media filters act as a crucial first line of defense (pre-treatment). Physically, the system consists of a pressure vessel packed with multiple layers of filter media.
To prevent this, multi media filters act as a crucial first line of defense (pre-treatment). Physically, the system consists of a pressure vessel packed with multiple layers of filter media.
Engineered to filter impurities in stages, its multi-layered design offers far more effective and stable performance than a standard single-sand filter.
When Is a Multi Media Filter Essential?
This filtration system is highly practical and strongly recommended when raw water turbidity exceeds 0.2 NTU. It is also mandatory whenever the Silt Density Index (SDI) of the water is greater than 3.
This becomes especially critical if your plant uses advanced membrane facilities such as Reverse Osmosis (RO), Nanofiltration (NF), or Electrodeionization (EDI). Membrane manufacturers typically require feed water SDI values to remain below 3 to prevent premature fouling. Utilizing filter media is significantly more economical than frequently replacing expensive filter cartridges or bags due to heavily contaminated water.
Operating Principle and Layer Configuration
The superior performance of a multi media filter lies in its density and size gradient. The lightest media is placed at the top layer, while the heaviest media sits at the very bottom. This stratified design ensures that larger debris is trapped first, followed progressively by smaller particles.
While a standard sand filter generally traps particles between 25 and 50 microns, a multi media system filters particles down to 10 to 25 microns (consistently holding down to 20 microns). When paired with chemical coagulant dosing to clump impurities, the system can capture particles as small as 10 microns.
The standard media configuration from top to bottom includes:
- Anthracite: The top layer. It has the lowest density and the largest particle size, designed to capture coarse impurities.
- Silica Sand: The middle layer. It features smaller grains and a higher density than anthracite, filtering out medium-sized particles.
- Garnet or Gravel: The bottom layer. Garnet is extremely dense, making it highly effective at trapping the finest remaining particles. Gravel is typically placed at the base as a support bed to prevent smaller media from escaping through the lower strainers.
Key Components in a Multi Media Filter System
Filtration performance relies on a combination of effective media and robust mechanical hardware, including:
1. Filter Tank
The primary pressure vessel containing the filter media. Materials include FRP, Stainless Steel, or Mild Steel for high-temperature resistance. FRP, Stainless Steel, atau Mild Steel (baja ringan) yang sangat tahan terhadap suhu tinggi.
2. Top and Bottom Strainers
Strainer atas bertugas menyebarkan aliran air secara merata saat siklus berjalan. Sementara strainer The top strainer evenly distributes incoming water flow during operation, while the bottom strainer retains the media bed while allowing clean water to pass through.
3. Valves and Piping
Valve Valves precisely control flow cycles. Non-metallic valves are strongly recommended for seawater desalination applications. Piping materials typically range from PVC to galvanized steel depending on operating pressures.
4. Controller
The core component managing automated operation, utilizing PLCs, electromechanical timers, or digital stagers.timer), atau stager digital.
5. Flow Controller
Installed on the drain line to regulate wash water flow rates, preventing media loss during backwash cycles.
Maintenance via Backwash Cycles
Agar kinerjanya tetap prima, filter ini memiliki kemampuan mencuci dirinya sendiri (backwashTo maintain peak performance, the system features a self-cleaning backwash mechanism. Water flow is reversed from bottom to top to fluidize the media bed and flush trapped particulates to the drain.
Setelah proses backwash selesai, sistem akan melakukan pembilasan (rinsingFollowing the backwash cycle, a rinse step settles the media bed and clears residual particulates before returning the filter to service.
Achieve Optimal Water Quality with the Experts
PT Hydromaster Harmoni Nusantara, a trusted water management specialist established in 2005, designs durable Silica Multi Media Filters (MMF) tailored to your operational requirements.
Hydromaster MMF systems are constructed with industrial-grade materials, high-durability pressure vessels, and fully integrated PLC automation for efficient backwashing.
To support flexible infrastructure investment, Hydromaster offers versatile commercial models, including DBOO (Design, Build, Operate, Own) and BOT (Build, Operate, Transfer) schemes.
Do not let poor water quality interrupt your production schedule. >Contact us today for reliable water treatment solutions!