Multigrade Filter - Pressure Sand Filter - Dual Media Filter

What is Multi Grade Filter?

A latest concept in the water treatment technology, a Multi Grade Filter consists of vertical or horizontal pressure sand filters that contain multiple layers of coarse and fine sand (pebbles and gravels) in a fixed proportion. It is a kind of a deep filter bed with adequate pore dimensions for retaining both large and small suspended solids and un-dissolved impurities like dust particles. As compared to conventional sand water filter, this multigrade filtration system works on higher specific flow rates. It is also a low cost pre-treatment system for ion exchangers (deionizer and softener) and membrane systems such as reverse osmosis etc. With high throughputs, high dirt-holding capacity and capacity to reduce turbidity and TSS (< 5ppm) from water, it protects ion-exchange resins and membranes from physical fouling due to suspended impurities present in the water.

Working Principle

The working principle of a multigrade filter is quite straight forward. In a multigrade filter or pressure sand filter, water is passed through multi layers of filter media consisting graded sand, pebbles and gravels layers. The contaminants in the water are captured in the media bed and filtered water passes into the discharge manifold at the bottom of the tanks. The next and last step is backwashing, a process of effectively removal of captured contaminants from the media bed. After back-washing the filter is rinsed with raw water and after the required quality of water is achieved the filter is put back into service.

Multigrade Filter - Pressure Sand Filter - Dual Media Filter
Features & Advantages
Designed for commercial & Industrial uses Manual or automatic operation options
Durable FRP or mild steel tank Custom sizes and configurations
Maximum carbon utilization Ideal for pre-treatment

Multigrade Sand Filters by Bionics

Our company is a prominent manufacturer of multi grade filter in India and provides engineering services from designing, manufacturing to installation and commissioning. Our multigrade sand filtration plants are designed to meet specific requirements of our customers; no matter what quality of water you use and what your flow rate requirements are, our engineering team is capable of configuring the same accordingly. From 1000 LPH to 1,00,000 LPH, we can manufacture and supply any capacity you need.

Technical Specifications

Model BMGF30 BMGF 40 BMGF 55 BACF70 BACF90
Flow Rate (LPH) 30000 40000 55000 70000 90000
Vessel Dia (mm) 1500 1800 2100 2200 2600
Vessel Height (mm) 1800 1800 1800 2000 2000
Shell Thickness 8mm 8mm 8mm 10mm 10mm
Dish Thickness 8mm 10mm 10mm 12mm 12mm
Filtration Media 1600 kg 1800 kg 2100 kg 2400 kg 4000 kg
Pressure Vessel MSEP (Mild Steel with epoxy)
Piping MS Rubber coated
Frontal Piping 100 Dia. 100 Dia. 125 Dia. 150 Dia. 150 Dia.
Backwash Manual backwash as standard
Backwash Manual backwash as standard
Collection System Header / Lateral
Type of Valve Butterfly Valve
Options - Automatic backwash controls
- pre / post- filter pressure gauges
- Air blower
- ASME stamped (steel vessels only)
- SA 516 Grade 70 carbon steel
- NABL Testing Certificate