Multimedia Filters (MGF) for RO Pre-Treatment
Multimedia / multigrade filters for RO and industrial pre-treatment: how layered anthracite, sand and garnet beat single-media sand filters, and how they are sized.
- Pan-India installation & service
- AMC support available
- Free site water-quality audit
- Custom-engineered to your TDS
- Capacity range
- 25 – 4,000+ LPH
- Indicative capex
- On design basis
- Installation lead time
- 48 – 72 hours
- Annual AMC
- 10 – 14% of capex
A multimedia (multigrade) filter layers coarse, light anthracite on top of finer sand and dense garnet. Dirt is captured through the depth of the bed rather than only at the surface, so the filter holds more solids between backwashes and delivers lower turbidity than a single-media sand filter.
That is why it is the standard pre-treatment ahead of commercial and industrial RO: membranes need low-turbidity feed, usually measured as SDI, and a multimedia filter is the economical way to get there on borewell water.
Sizing follows flow, as with any pressure filter, and backwashing is manual or automatic.
Where a multimedia filter sits in the train
- Raw water → (iron removal if needed) → multimedia filter → activated carbon filter → softener or antiscalant → cartridge filter → RO.
- On high-turbidity surface water, ultrafiltration can replace or follow it to give consistently low SDI.
Installation, commissioning and service response
Commercial buyers are buying uptime, so the commercial terms matter as much as the equipment specification. Insist on these being written into the purchase order rather than discussed verbally.
- Site survey and feed-water analysis before the final quotation — never accept a specification produced without a water report.
- Defined commissioning scope: civil and electrical prerequisites, who supplies what, and a documented performance test at handover.
- Written service response times, with escalation, and clarity on whether spares are held locally.
- Operator training and a laminated SOP left on site, so routine flushing and cartridge changes do not depend on one person.
- Warranty terms stated separately for membranes, pumps, vessels and instrumentation, because they differ.
What a quotation includes
- Feed turbidity / SDI review
- Vessel sizing by peak flow
- Anthracite, sand and garnet media layers
- Backwash valve and controls
- Commissioning with outlet turbidity check
Why specify with us
Low total cost of ownership
High-rejection membranes, correctly sized pre-treatment and efficient pumps reduce power draw, consumable spend and reject volume. We quote five-year operating cost alongside capex, because that is the number that actually matters.
Heavy-duty SS-304 / SS-316 build
Corrosion-resistant stainless chassis and wetted parts engineered for continuous 24/7 duty, with SS-316 specified where chlorides or process chemistry demand it.
Rapid on-site servicing & AMC
Pan-India installation and service, with written response times and escalation in the AMC rather than verbal assurances — because plant downtime, not the repair, is your real cost.
Custom TDS tuning
Systems engineered against your actual water analysis — brackish groundwater, municipal supply or heavy borewell input, including high-TDS configurations for 3,000+ ppm feed.
Treatment architecture
- 1
Pre-treatment module
Multigrade sand and activated carbon filtration strips suspended solids, turbidity and chlorine that would otherwise oxidise the RO membrane.
- 2
Softening / antiscalant dosing
Protects membranes from calcium and magnesium scaling. On hard feed water this stage is not optional — it determines membrane life.
- 3
High-pressure RO module
Heavy-duty booster pumps drive feed water through industrial spiral-wound membranes at 12-18 bar in an array sized for your recovery target.
- 4
Post-treatment disinfection
UV disinfection and ozonation, with mineral dosing where potable taste and consistency matter.
- 5
Microprocessor / PLC controls
Auto start-stop on tank level, dry-run protection, high and low pressure cut-offs, and timed membrane flushing — with data logging on industrial plants.
Frequently asked questions
What is the difference between a sand filter and a multimedia filter?
What is the typical lead time for commercial installation?
Do you offer Annual Maintenance Contracts (AMC)?
Need a quote for multimedia filters today?
Share your water analysis report and output requirement, and our technical team will build a system specification with capex, five-year operating cost and AMC options.