Vacuum Filtration vs Membrane Filtration
Vacuum filtration and membrane filtration are related but distinct concepts that are often used together in laboratory workflows. Vacuum filtration uses a pressure differential — created by a vacuum pump or vacuum line — to draw a liquid sample through a filter medium. Membrane filtration refers to the use of a membrane medium to separate particles, microorganisms, or other components from a liquid sample based on pore size. In most laboratory filtration systems, vacuum filtration and membrane filtration are used together: the vacuum drives the sample through the membrane. The two terms are not mutually exclusive and are often used interchangeably in the context of laboratory filtration apparatus.
Single-Station vs Multi-Station Filtration Systems
Single-Station Filtration Systems
Single-station laboratory filtration systems process one sample at a time through a single filtration head and membrane. They are suited for lower-throughput workflows, method development, and applications where sample-to-sample contamination control is a priority. Single-station systems typically have a smaller benchtop footprint and simpler cleaning requirements than multi-station manifolds.
Multi-Station Filtration Manifolds
Multi-station filtration manifolds allow multiple samples to be filtered simultaneously through independent filtration heads on a shared vacuum manifold. They are suited for higher-throughput workflows such as water testing, environmental monitoring, and quality-control applications where multiple samples must be processed in parallel. Station count, manifold material, and valve configuration vary by platform. Cleaning and cross-contamination control between stations must be confirmed for your specific workflow.
Popular Laboratory Filtration System Manufacturers and Models
mLab Supply sources laboratory filtration systems from leading manufacturers including MilliporeSigma, Sartorius, Pall, Thermo Scientific, and Advantec. Common models available to source include:
MilliporeSigma
- Milliflex Plus, Sterifil Aseptic System
Sartorius
- Microsart e.jet, Microsart Manifold
Pall
- Sentino
Thermo Scientific
- Nalgene Vacuum Filtration Apparatus
Advantec
- Multi-Station Vacuum Filtration Manifold
Laboratory Filtration vs Tangential Flow Filtration
Laboratory filtration systems and tangential flow filtration (TFF) systems are different categories of filtration equipment suited to different workflows. Laboratory filtration systems typically support vacuum-driven or gravity-driven membrane filtration for microbiology sample preparation, water testing, media clarification, and general laboratory filtration. The feed is directed through the membrane in a direct or dead-end flow path. Tangential flow filtration systems use a crossflow membrane process in which the feed moves tangentially across the membrane surface and are used for protein concentration, buffer exchange, diafiltration, and biologics process development. They are distinct categories and are not interchangeable.
Buying Used and Refurbished Laboratory Filtration Systems
Used and refurbished laboratory filtration systems can offer significant cost savings compared to new instruments. When evaluating a used filtration system, key inspection points include:
- Pump condition: For systems with integrated vacuum pumps, confirm pump condition, vacuum integrity, and seal condition.
- Manifold condition: Confirm manifold body condition, valve function, and port integrity.
- Seals and O-rings: Confirm seal condition and compatibility with your cleaning agents and sample types.
- Tubing: Confirm tubing condition and connector integrity. Tubing replacement status varies by unit.
- Filtration heads and holders: Confirm filtration head condition and compatibility with your membrane format.
- Bottles and reservoirs: Confirm collection bottle or reservoir condition and inclusion. Bottle inclusion varies by unit.
- Controls: Confirm valve and control function where applicable.
- Service history: Request available service and calibration records where available.
- Included accessories: Confirm which accessories are included. Membranes, tubing, and other consumables vary by unit and are not guaranteed to be included.
Membrane inclusion, tubing condition, seal condition, and accessory completeness must be confirmed per unit. mLab Supply does not guarantee that any used or refurbished system meets specific regulatory or institutional requirements without independent verification.
Membranes, Filter Holders, and Consumables
Laboratory filtration systems require membranes matched to the system platform, pore size, and application. Membrane type, pore size, and diameter must be confirmed for compatibility with your sample and workflow before purchasing a used system. Reusable filter holders and funnels must be compatible with the membrane diameter and the system's vacuum path. Replacement seals, O-rings, and tubing are platform-specific and must be confirmed for compatibility. Consumables are not guaranteed to be included with used filtration systems unless explicitly stated. Confirm consumable availability and compatibility for the specific system before purchasing.
Applications
Laboratory filtration systems support a wide range of sample filtration and quality-control workflows including microbiology sample filtration, water testing, environmental monitoring, pharmaceutical quality control, media and sample clarification, membrane filtration, sterility-testing preparation, and general laboratory vacuum filtration. Suitability for specific regulated applications or institutional quality requirements must be confirmed by the buyer and their compliance team.
Cleaning, Maintenance, and Verification
Laboratory filtration systems require regular cleaning and maintenance to maintain performance and prevent cross-contamination between samples. Key maintenance considerations include cleaning of manifolds, filtration heads, and holders between uses; seal and valve inspection and replacement; vacuum-path integrity checks; pump maintenance where applicable; tubing condition and replacement; and leak checks after reassembly. Autoclavability and chemical compatibility of cleaning agents must be confirmed for the specific system materials. Performance verification is recommended after relocation or extended storage. Service history and maintenance records should be requested when purchasing a used system.
Installation and Workflow Planning
Laboratory filtration systems are typically benchtop instruments with compact footprints. Key installation considerations include available bench space, vacuum source (integrated pump or external vacuum line), power requirements where applicable, waste collection and drain access, tubing routing, sample vessel placement, and cleaning area access. Performance verification is recommended after installation and after any relocation. Confirm all site and utility requirements for the specific system before finalizing a purchase.
Procurement and Logistics
mLab Supply supports institutional procurement workflows including formal quotations, purchase orders, and vendor onboarding documentation. We can source specific laboratory filtration system models and configurations on request, including discontinued platforms. Freight and shipping coordination is available. We also purchase surplus and decommissioned laboratory filtration systems — contact us via the Sell Lab Equipment page if you have equipment available.
Frequently Asked Questions
What is a laboratory filtration system?
A laboratory filtration system is a reusable instrument or apparatus used to filter liquid samples through a membrane or filter medium in laboratory workflows. Laboratory filtration systems are used for microbiology sample preparation, water testing, environmental monitoring, media clarification, and general laboratory vacuum filtration.
What is the difference between vacuum filtration and membrane filtration?
Vacuum filtration uses a pressure differential created by a vacuum pump or vacuum line to draw a liquid sample through a filter medium. Membrane filtration refers to the use of a membrane to separate particles or microorganisms from a liquid sample based on pore size. In most laboratory filtration systems, vacuum filtration and membrane filtration are used together — the vacuum drives the sample through the membrane.
What is the difference between laboratory filtration and tangential flow filtration?
Laboratory filtration systems use direct or dead-end flow through a membrane for sample preparation, microbiology, and general filtration workflows. Tangential flow filtration (TFF) systems use a crossflow membrane process for protein concentration, buffer exchange, and diafiltration in biologics workflows. They are distinct categories suited to different applications.
What is the difference between single-station and multi-station filtration systems?
Single-station systems process one sample at a time through a single filtration head. Multi-station manifolds allow multiple samples to be filtered simultaneously through independent heads on a shared vacuum manifold. Multi-station systems are suited for higher-throughput workflows such as water testing and environmental monitoring.
What should I inspect before buying a used laboratory filtration system?
Key inspection points include pump condition and vacuum integrity for integrated-pump systems, manifold condition, valve function, seal and O-ring condition, tubing condition, filtration head and holder condition, collection bottle inclusion, and available service history. Membrane and accessory inclusion varies by unit.
Are membranes included with used laboratory filtration systems?
Membrane inclusion varies by unit. mLab Supply does not guarantee that membranes or filter media are included unless explicitly stated for a specific listing. Confirm membrane requirements and compatibility before finalizing a purchase.
Are vacuum pumps included with used filtration systems?
Vacuum pump inclusion varies by system. Some laboratory filtration systems include an integrated vacuum pump; others require an external vacuum source. Confirm pump inclusion and vacuum source requirements for the specific system before purchasing.
Can mLab Supply source a specific MilliporeSigma, Sartorius, Pall, Thermo Scientific, or Advantec filtration system?
Yes. We source laboratory filtration systems from MilliporeSigma, Sartorius, Pall, Thermo Scientific, Advantec, and other manufacturers on request. Submit a Request a Quote with your preferred manufacturer, model, and configuration requirements and we will confirm current sourcing options and availability.
Are refurbished laboratory filtration systems suitable for regulated laboratories?
Suitability for regulated environments depends on the specific system's condition, cleaning history, and your institution's qualification requirements. mLab Supply does not guarantee that any used or refurbished system meets specific regulatory or institutional standards without independent verification. Consult your quality and compliance team before purchasing for regulated use.
What consumables should I confirm before purchasing a used filtration system?
Confirm membrane pore size, diameter, and chemistry compatibility; seal and O-ring compatibility with your cleaning agents; tubing type and connector compatibility; and collection bottle or reservoir inclusion. Consumables are not guaranteed to be included unless explicitly stated for a specific listing.
Does mLab Supply coordinate shipping and setup for laboratory filtration systems?
Yes. Contact us when requesting a quote to discuss shipping and any setup coordination requirements for your specific location.
Does mLab Supply purchase surplus laboratory filtration systems?
Yes. We purchase decommissioned and surplus laboratory filtration systems and other laboratory equipment. Visit our Sell Lab Equipment page to submit details about your equipment.