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Product Water Treatment

Filter Media (Garnet)

High-density garnet media for multimedia filters—supports stable bed stratification and deep-bed filtration to improve turbidity removal and extend filter runs. Supplied in multiple size grades to match your filter design and operating conditions.

High specific gravity Depth filtration layer Stable stratification COA / sieve analysis
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Packaging: bags / supersacks / bulk (as applicable)
Documentation: COA + sieve analysis / SDS on request
Lead time depends on size grade & volume

Tell us your vessel dimensions, underdrain type, target flow rate, and current media stack (if any). We’ll align grade selection and a practical supply offer.

Overview

Garnet is a high-density filtration media commonly used as the bottom layer in dual-media and tri-media filter beds. Its specific gravity helps it remain in the lower zone during backwash, supporting stable stratification and enabling true depth filtration across the media stack.

In practice, a properly graded garnet layer can improve particle capture in the lower bed, reduce turbidity breakthrough, and help extend filter run times—especially when paired with sand and anthracite (or other media) above it.

Depth filtration

Supports particle capture through the bed (not just at the surface), improving turbidity performance.

Stable stratification

High density keeps garnet in the bottom layer during backwash when bed design is correct.

Longer filter runs

Can reduce early headloss buildup and delay turbidity breakthrough (system dependent).

Procurement-ready

Standard sizes and packaging with COA / sieve analysis and SDS available on request.

Where garnet is typically used

Rapid gravity filters, pressure multimedia filters, industrial process water pretreatment, tertiary filtration, and RO pretreatment where low turbidity and reliable performance are required.

Applications

Common systems where garnet media is specified as a dense underlayer for improved filtration reliability.

Water treatment lane

Dual / tri-media filter beds

Used beneath sand and anthracite to support stable layering and depth filtration.

Typical goal: better turbidity performance and longer runs.

Municipal filtration

Clarification/filtration trains where consistent effluent quality is required.

Specify grade based on design rate and raw water variability.

Industrial process water

Pretreatment for boilers, cooling systems, and process units requiring reduced suspended solids.

Often paired with chemical coagulation/flocculation upstream.

RO / membrane pretreatment

Media filtration ahead of cartridges/membranes to control SDI and turbidity (system dependent).

Confirm target SDI/turbidity and operating flux.

Well water and surface water polishing

Helps remove fine particulates that drive downstream fouling and turbidity excursions.

Share iron/manganese and turbidity profile for best matching.

Tertiary filtration

Downstream of biological treatment for enhanced solids removal before reuse/discharge.

Bed design and backwash strategy are critical for stable operation.

Typical specifications & grades

Values depend on origin and grade. Confirm exact figures and sieve distribution on quotation.

Quality & documentation
Media type Natural garnet filtration media (high-density mineral)
Role in bed Bottom layer (underlayer) in multimedia filtration stacks
Specific gravity (typ.) High-density media; confirm by grade/origin on COA
Hardness (typ.) High abrasion resistance suitable for repeated backwash cycles (confirm on offer)
Size grades Multiple effective sizes / mesh ranges available (provide your filter design and target performance)
Uniformity coefficient Grade dependent; sieve analysis provided on request
Cleanliness Washed and graded; typical limits (fines/moisture/turbidity) confirmed on COA
Packaging 25 kg bags / 1,000 kg supersacks / bulk (as applicable)
Documentation COA + sieve distribution, SDS on request (compliance requirements can be checked per sourcing lane)
Grade selection guidance

Most designs choose garnet as a finer, denser layer below sand/anthracite. Grade depends on vessel hydraulics, design rate, turbidity profile, and backwash capability. Provide your design details and we’ll recommend a suitable size range for quotation.

Design & operation notes

Garnet performance depends on correct bed design (layering, depth, sizing) and the backwash regime. In multimedia beds, density and particle size are chosen to maintain stratification after backwash while providing progressive filtration through the bed.

Layer stability

Correct density/size pairing helps keep garnet in the bottom layer after backwash.

Headloss management

Balanced sizing and depth help delay premature surface blinding and manage headloss growth.

Backwash capability

Confirm water/air scour capacity to achieve adequate expansion and cleaning without media loss.

  1. Confirm underdrain and nozzle condition
    Check for damaged laterals/nozzles to avoid media migration and loss.
  2. Load media in correct sequence
    Garnet typically loads first (bottom), then sand, then anthracite (or other top media) per design.
  3. Initial rinse and backwash
    Rinse until clear; perform controlled backwash to remove fines and set the bed stratification.
  4. Validate performance targets
    Track effluent turbidity, run time, headloss, and backwash effectiveness during early operation.
  5. Lock operating windows
    Finalize service flow and backwash parameters; document for routine operation and procurement.
Practical info we use to recommend the right grade

Vessel diameter/area, design rate, influent turbidity (typical/peak), coagulant usage, underdrain type, available backwash flow/air scour, existing media sizes and depths, and any historical issues (mudballing, cementing, media loss).