Filter Units

Our range of filter devices, funnels, and accessories for vacuum filtration are usually used in media preparation. They can be disposable, glass or plastic, and can include a membrane.

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Thermo Scientific™ Nalgene™ Rapid-Flow™ Filter Units

Sterile, disposable filter units with PES, CN, SFCA or nylon membranes for fast flow rates and high throughput.

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Sartorius Sartolab™ RF Vacuum Filtration Units

High Flow Rate and Large Filtration Area

Single-use units with a polyethersulfone (PES) membrane for the sterile
filtration of a sample.

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DWK Life Sciences DURAN™ Witt-Type Filter Apparatus

For Solid-Liquid Filtration and Filtrate Processing

Supplied with interchangeable lid and KECK™ assembly set (standard ground joint: 29/32).

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Useful Links

Thermo Scientific Nalgene

Fisherbrand

DWK Life Sciences

Sartorius

Whatman products Cytiva

All Filter Units

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Product Code 4231972

Thermo Scientific™ Nalgene™ Rapid-Flow™ Sterile engangsfilterenheder med PES, CN, SFCA eller Nylon Membraner

Product Code 4304123

Sartorius Udstyr og tilbehør til vakuumfilterholdere

Product Code 4304119

Sartorius Sprøjtefilterholdere

Product Code 10188611

Product Code 8012737

Product Code 7189213

Product Code 7237798

Must Have

Product Code 4187735

Sartorius Sartolab™ P20 Plus filtersystemer

Product Code 11630029

DWK Life Sciences DURAN™-filtreringsapparat med modtagekolbe og tragt

Product Code 4231974

Sartorius Sartolab™ P20 Trykfilter, Type 18072-D, 0,7 m μGF

Product Code 11748799

Product Code 9023003

Product Code 8007452

Product Code 7214261

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Fisherbrand™ Diaphragm Pump

With carbon fibre reinforced PTFE pump heads, this chemical-resistant vacuum pump is ideal for applications involving aggressive solvents and acidic vapors.

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Syringeless Filters and Syringe Filters

Syringe filters and syringeless filters are commonly constructed from PVDF or PTFE. They are used to filter impurities such as fine particles from small to medium sample volumes prior to use and are suitable for both aqueous and aqueous-organic samples.

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Sartorius™ Cellulose Acetate Membrane Filters

Combining high flow rates and thermal stability with very low adsorption characteristics, these filters are well suited for use in pressure filtration devices.

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FAQ

Vacuum Filter Units use vacuum pressure to draw liquid through a filter membrane into a collection vessel, ideal for filtering larger volumes quickly.
Bottle-top Filter Units screw directly onto collection bottles, often incorporating a filter membrane and funnel, and can also be used with vacuum for faster filtration, though small volumes can be filtered via gravity as well.

Use a Vacuum Filter Unit when:

Filtering large volumes (commonly 250 mL to several liters)
Rapid filtration is required
Working with viscous or particulate-heavy solutions

Use a Bottle-top Filter Unit when:

Convenience and sterility are priorities
Medium to large volumes (typically 150 mL to 1000 mL) need filtering directly into a storage bottle
Working in cell culture, media preparation, or buffer sterilization

Most units are supplied pre-sterilized, especially those intended for biological or
pharmaceutical use. Always check the packaging for sterilization status. If sterility is required and the unit is not pre-sterilized, you must autoclave or otherwise sterilize the filter housing and membrane before use, provided the materials are compatible.

Standard Pore Sizes:

0.2 μm: Sterilization of liquids (bacteria removal)
0.45 μm: General filtration, particle removal
1.0 - 5.0 μm: Prefiltration to extend the life of finer filters

Choosing a pore size depends on your application:

Cell culture media: Typically 0.2 μm
Clarifying aqueous solutions: 0.45 μm
Prefiltration of dirty samples: 1.0 μm or larger

Single-use plastic units (common in bottle-top and vacuum filter systems) are designed for one-time use to maintain sterility and performance.
Reusable filter units made from glass, stainless steel, or autoclavable plastics are available but require proper cleaning and sterilization between uses. Always consult the manufacturer's guidelines regarding reuse, as filter membranes themselves are typically single-use.

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Syringeless Filters and Syringe Filters

Filter Units

Thermo Scientific™ Nalgene™ Rapid-Flow™ Filter Units