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Microfiltration
MF Membranes — Microfiltration Modules
MF membranes separate at 0.1 to 10 micrometres, removing suspended solids, turbidity, most bacteria and protozoan cysts at operating pressures of 0.1 to 2 bar. They pass dissolved salts, dissolved organics and viruses, and are used to protect finer stages downstream.
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Answer first
What MF Membranes Are, and How They Are Specified
MF membranes separate at 0.1 to 10 micrometres, removing suspended solids, turbidity, most bacteria and protozoan cysts at operating pressures of 0.1 to 2 bar. They pass dissolved salts, dissolved organics and viruses, and are used to protect finer stages downstream.
Microfiltration is the coarsest of the membrane processes and the cheapest to run, since transmembrane pressure is low. Its role is almost always protective: taking the solids load off a stream before it reaches a UF, NF or RO stage that would foul on it.
Where the requirement is genuinely only solids and turbidity, MF can be the complete answer. Where the requirement mentions colloids, SDI or viruses, ultrafiltration is the correct process instead.
Specification
MF module specification
| Parameter | Typical value or range | Notes |
|---|---|---|
| Pore size | 0.1–10 µm | Coarsest of the membrane processes |
| Operating pressure | 0.1–2 bar | Low energy compared with UF and RO |
| Removes | Suspended solids, turbidity, most bacteria and cysts | Physical barrier |
| Does not remove | Dissolved salts, dissolved organics, viruses | UF is the step up for viruses and colloids |
| Module format | Hollow fibre, tubular, cartridge | Format chosen from solids load |
| Backwashable | Generally yes | Interval set by feed solids |
| Typical duty | Pre-treatment and clarification | Rarely the final barrier |
Pore size
- Typical value or range
- 0.1–10 µm
- Notes
- Coarsest of the membrane processes
Operating pressure
- Typical value or range
- 0.1–2 bar
- Notes
- Low energy compared with UF and RO
Removes
- Typical value or range
- Suspended solids, turbidity, most bacteria and cysts
- Notes
- Physical barrier
Does not remove
- Typical value or range
- Dissolved salts, dissolved organics, viruses
- Notes
- UF is the step up for viruses and colloids
Module format
- Typical value or range
- Hollow fibre, tubular, cartridge
- Notes
- Format chosen from solids load
Backwashable
- Typical value or range
- Generally yes
- Notes
- Interval set by feed solids
Typical duty
- Typical value or range
- Pre-treatment and clarification
- Notes
- Rarely the final barrier
Typical ranges across the module class. Final values follow the datasheet of the module quoted.
Selection guidance
Do not buy MF to solve an SDI problem
MF removes what you can see. SDI is driven by fine colloidal material well below the MF pore rating, so a stream can pass through microfiltration, come out visually clear, and still carry an SDI₁₅ above the limit an RO element specifies.
If the reason for the barrier is RO protection and the measured problem is SDI, ultrafiltration is the correct specification. MF ahead of UF is sensible where solids would otherwise shorten UF backwash intervals.
Application mapping
Where MF Membranes Are Used
Pre-treatment ahead of UF or RO
- Typical requirement
- Solids load reduced before the finer stage
- Indicated configuration
- MF sized on peak solids rather than average
Turbidity removal
- Typical requirement
- Visually clear output from a variable source
- Indicated configuration
- Backwashable hollow fibre or tubular MF
Process stream clarification
- Typical requirement
- Solids separation without changing dissolved composition
- Indicated configuration
- MF with a backwash regime matched to the load
Commercial terms
How This Category Is Quoted
Water treatment does not have a list price, and any supplier quoting one before seeing a feed analysis is quoting a different plant from the one you need.
Pricing basis
On request, and capacity-dependent. Plant pricing moves with capacity, feed water analysis and the recovery target; membranes, cartridges and resins are quoted per element, per lot or per litre of media.
Order quantity
From a single replacement element or a case of cartridges through to full plant scope. Consumable lines are quoted per box or per lot, and the lot size is stated on the quotation.
Lead time
Confirmed per line item at quotation stage. Stocked consumable lines and made-to-order plant differ substantially, so a single blanket lead time for the category would be misleading — the quotation carries the figure for each line.
Invoicing
GST invoice against company or institutional purchase order. Proforma issued where advance payment or internal approval requires it.
Delivery coverage
Despatch from Delhi NCR across India, including plant, project and institutional sites. Delivery city and site access are asked for at enquiry because both affect despatch mode.
Documentation
Technical datasheet for the item quoted, and a test certificate where the principal supplies one with that product. Tender and institutional documentation formats are prepared on request — send the format with the enquiry so the quotation is issued in a form you can submit without rework.
Request for quotation
Request a Quote — MF Membranes
Fields marked with an asterisk are required. The technical fields are what usually decide whether you get a quotation on the first pass or three emails of clarification.
Frequently asked
MF Membranes — Common Questions
What is the difference between microfiltration and ultrafiltration?
Pore size and therefore what is retained. MF works at 0.1 to 10 micrometres and removes suspended solids, turbidity and most bacteria. UF works at 0.01 to 0.1 micrometres and additionally removes colloids, most viruses and macromolecules.
For RO pre-treatment the distinction matters, because colloidal material is what drives SDI and MF largely passes it.
Does microfiltration remove bacteria?
Most bacteria, yes, since they are generally larger than the pore rating. Protozoan cysts are removed reliably.
Viruses are not removed reliably at MF ratings — they are smaller than the pores. Where virus removal matters, ultrafiltration is the process.
Is a microfiltration membrane the same as a cartridge filter?
They overlap in rating but not in construction or duty. A membrane cartridge at 0.22 or 0.45 micrometres is a microfiltration-rated device, usually a disposable final filter.
An MF module in a treatment train is generally a backwashable, continuously operated barrier rather than a disposable element. Which you need depends on whether the solids load justifies backwashing.
Related Products and Categories
Specified alongside mf membranes, and the category this page sits in.
UF membranes for colloids and SDI0.45 micron filters for water analysisCartridge filters for disposable dutyBack to Membrane Filtration
- Delhi NCR base with pan-India supply, including plant and project sites.