Filtermart™ Coalescer Filters

Filtermart stocks coalescer filters, coalescer cartridge filter elements, and full coalescer assembly components for liquid, gas, and specialty chemical service. The same technology is described in several ways across the industry, including liquid coalescers, liquid-liquid coalescers and separators, LL coalescers, coalescing filter elements, and coalescer elements. Whatever terminology is used, the underlying function is the same.

Liquid-Liquid Coalescer Separation

A liquid-liquid coalescer separator is built specifically to separate two immiscible liquids, free water trapped in fuel or condensate mixed into hydraulic oil, for example. As the mixture passes through the liquid-liquid coalescing media, the denser fluid's droplets bind together and settle out, leaving a noticeably drier, cleaner liquid behind.

This separation principle is used across our liquid coalescer systems for emulsion separation in fuel handling, lubrication, and process water treatment. Because separation depends on droplet size and surface chemistry rather than brute filtration, each coalescing element is matched to the specific gravity difference and flow rate of the application it serves.

Coalescer Filter Media & Cartridge Options

Coalescer performance comes down to the coalescer filter material and how the element is packaged. Filtermart offers several formats, so the right style is available for the housing and flow conditions on hand:

• Coalescer filter cartridge: A wound or pleated cartridge sized to drop into standard housings as a direct replacement
• Coalescer pack: Multi-element sets used where a single cartridge can't handle the required flow volume
• Coalescer pad: Flat or wrapped media used in tank and vessel-mounted applications
• Coalescer bag: Bag-style media for lower-pressure, higher-volume liquid streams
• Fiberglass, cellulose, and fluoropolymer coalescers media, chosen based on chemical compatibility and micron rating requirement
• Small flow coalescer cartridges for low-volume or instrument-scale lines where a full-size housing isn't practical

Many installations pair coalescing and cartridge filters in the same housing, a coarser stage ahead of the coalescing filter cartridge to protect the fine media from bulk contamination and extend its service life.

Filtermart Coalescer Filter Types

Liquid Coalescer Elements

The liquid coalescer element line covers the FMC series used to strip water and free moisture from fuels, lubricants, and other process liquids. Each liquid-liquid coalescer filter in this range doubles as a coalescer element filter, also listed under filtration products, available across a range of micron ratings and support-core options. So, a liquid coalescing filter can be matched closely to OEM specifications rather than forcing a compromise fit.

Liquid-Gas Coalescers

A liquid-gas coalescer filter (also written as a gas-liquid coalescing filter) removes fine liquid aerosols and mist from a gas stream, standard practice in compressed air systems, natural gas processing, and instrument air lines.

Filtermart carries horizontal coalescer units, vertical liquid gas coalescers, liquid gas coalescing filter elements, and complete liquid gas coalescer housing and liquid gas coalescing filter housing assemblies, plus gas-liquid coalescing filters sized for higher-pressure, higher-velocity service.

Fluoropolymer & Specialty Coalescers

For aggressive chemical streams, fluoropolymer coalescers hold up where standard media would degrade quickly. These are typically specified for chemically demanding service, including certain chemical-manufacturing lines such as intermediate purification steps in coalescers for nylon production and similar polymer feedstock processing.

Coalescer Vessels & Filtration Systems

Beyond individual cartridges, coalescer filtration is also supplied as complete vessels and packaged coalescers filtration system skids. A horizontal coalescer vessel is common where floor space allows and residence time matters most; vertical units suit tighter footprints and higher gas velocities.

For temporary or project-based needs, a liquid coalescer skid can be brought in as a packaged unit rather than a permanent installation. For temporary or project-based requirements, operators may also use rental equipment, with Filtermart supplying the replacement coalescer and separator elements used by those skids.

Buy Reliable Coalescer Filter Brands

Sourcing from a single coalescer filter manufacturer isn't always possible when a plant runs mixed equipment, which is why Filtermart cross-references coalescer cartridges against the major coalescer manufacturers used across industry.

That includes Facet filters, known for their Aquasep coalescer and Medallion coalescer cartridge lines. Its Aquasep coalescers in particular are a common OEM cross-reference alongside Pall filters, Parker filters, Velcon filters, and Hydac filters. Whether the goal is an exact OEM match, a retrofit coalescer upgrade, or a straight swap for a surplus our coalescing filter already on the shelf, the part is cross-referenced before it ships.

Why Choose Filtermart Coalescer Filters?

Filtermart coalescer filters are engineered to hold up under fluctuating pressure and constantly changing flow velocity, two of the most common reasons coalescer media fails early in the field. Benefits include:

• High-efficiency coalescer filters built to manufacturer-matched specifications for drop-in replacement.
• Wide inventory spanning liquid, gas, and specialty coalescer cartridge configurations.
• Reliable coalescing systems that extend machinery life and reduce unplanned maintenance.
• Volume pricing and distributor support for larger or recurring orders.

Coalescer Housings, Sizing & Replacement Filters

A few details make it easier to select the correct replacement on the first order:

• Flow rate and pressure: Undersized coalescers push droplets through before they can merge, while oversized units add unnecessary cost; this is the core of filter coalescer sizing
• Fluid pair: Liquid-liquid, liquid-gas, or a specialty chemical stream all call for different coalescer filter media
• Micron rating: Finer ratings capture smaller droplets but may need more frequent element changes
• Housing compatibility: Check the housings and vessels the coalescer cartridge or coalescing cartridge will sit in, including port size, coalescer filter housing style, cast or fabricated construction (including liquid filter casting builds for higher-pressure service), and seal configuration

Filtermart's catalog is cross-referenced against OEM part numbers, which makes it straightforward to match an existing coalescer assembly or upgrade to a more efficient replacement without changing the surrounding hardware. Full specification sheets are available through Filter Literature for engineers confirming dimensions before ordering.

Frequently Asked Questions

What is a coalescer filter used for?

A coalescer filter separates two fluids that don't mix, most often removing water, oil mist, or other liquid droplets from a gas or liquid stream. It works by merging tiny droplets into larger ones that gravity can then pull out of the flow.

How does a liquid-liquid coalescer separator differ from a strainer?

A strainer or particulate filter blocks solid debris. A liquid-liquid coalescer instead targets a second liquid phase suspended in the main flow, using specialized media to encourage those droplets to combine and settle out rather than simply trapping solids.

What's the difference between a coalescer and a separator filter?

A coalescer grows small droplets into larger ones. A separator filter then prevents those larger droplets from re-entering the flow stream. The two stages are often paired together for maximum removal efficiency.

How is a coalescer filter sized?

Sizing comes down to flow rate, operating pressure, the fluid pair involved, and the droplet size that needs to be removed. Undersizing a unit lets droplets pass through before they can merge. Oversizing adds cost without improving performance, which is why filter coalescer sizing is usually confirmed against the OEM spec sheet or the original equipment's flow data before ordering.

How often should coalescer elements be replaced?

Replacement intervals depend on flow rate, contamination load, and pressure drop across the element. As a coalescer cartridge loads up, differential pressure rises. Most plants schedule replacement once pressure drop reaches the manufacturer's recommended limit, rather than on a fixed calendar basis.

Are Filtermart coalescer filters compatible with existing OEM housings?

Yes. Filtermart coalescer filter elements and coalescer cartridge configurations are cross-referenced to major OEM part numbers, so they're built as drop-in replacements for existing coalescer filter housing and vessel setups without requiring hardware changes.

Can coalescer filters handle both liquid and gas applications?

Yes! Filtermart offers separate product lines for each. Liquid coalescer elements are built for liquid-liquid separation, while gas-liquid coalescers are engineered specifically for removing liquid aerosols and mist from gas or air streams.

Whatever the application, matching the right coalescer filter to the fluid pair, flow rate, and housing keeps a process running clean and protects the equipment downstream. Browse the full Filtermart coalescer filter catalog, check compatible liquid filters and housings to complete the system, or reach out through contact for help confirming the right part number.