ROCKER Stream Continuous Filtration System

Overview

The ROCKER Stream Continuous Filtration System is an engineered solution for uninterrupted, high-volume liquid processing in research and production laboratories. Designed around a gravity- or vacuum-driven continuous flow architecture, the system eliminates manual intervention during filtration by integrating a dual-chamber funnel assembly with integrated overflow management and passive liquid transfer. Unlike conventional batch filtration setups, the Stream platform maintains constant head pressure across the membrane surface—minimizing concentration polarization and preserving consistent flux rates over extended operation. Its modular design supports both small-scale method development (300 mL configuration) and scalable process validation (1000 mL configuration), making it suitable for applications ranging from buffer exchange in protein purification to pre-sterilization clarification of cell culture harvests. The system operates without pumps or electronic controls, relying instead on passive hydrostatic principles and precision-machined fluidic pathways—ensuring intrinsic safety, operational simplicity, and compatibility with GMP-aligned workflows.

Key Features

• True continuous filtration: Integrated overflow channel and secondary reservoir enable uninterrupted throughput without manual decanting or filter replacement mid-process.
• Chemically inert construction: Borosilicate glass filter cups and bases, PTFE-silicone sleeve assemblies, and ground-glass frits provide broad compatibility with organic solvents, strong acids, and alkaline solutions (pH 0–14).
• Autoclavable components: PP GL45 filtration adapters and aluminum clamps withstand repeated steam sterilization (121°C, 20 min, 1 bar), supporting aseptic processing and ISO 13485-compliant device manufacturing environments.
• Standardized membrane interface: 47 mm and 90 mm diameter support accommodates commercially available track-etched, nylon, PVDF, and PES membranes—fully compliant with ASTM F838-22 for bacterial retention testing.
• Ergonomic anchoring system: Precision-machined anodized aluminum clamps ensure leak-tight sealing under vacuum (up to −0.95 bar) while enabling rapid assembly/disassembly without tools.
• Scalable modularity: Interchangeable sleeves, bases, and connectors allow reconfiguration between 300 mL and 1000 mL formats using shared accessories—reducing inventory complexity and cross-contamination risk.

Sample Compatibility & Compliance

The Stream system demonstrates validated compatibility with aqueous buffers (e.g., PBS, Tris-HCl), ethanol/water mixtures, acetone, isopropanol, and 1 M NaOH. It is not recommended for use with concentrated hydrofluoric acid or chlorinated solvents above 60°C. All wetted parts comply with USP Class VI biological safety standards and meet EU Regulation (EC) No 1935/2004 for materials intended to contact medicinal products. When used with certified low-protein-binding membranes and sterilized via autoclaving, the system satisfies requirements for sterile filtration validation per ISO 13408-1 and supports FDA 21 CFR Part 11–aligned documentation when paired with validated lab notebook practices.

Software & Data Management

As a purely mechanical, non-electronic filtration platform, the Stream system does not incorporate embedded firmware or digital interfaces. This architecture ensures zero electromagnetic interference, no software validation burden, and full compliance with ALCOA+ data integrity principles in paper-based or hybrid electronic lab notebook (ELN) workflows. Users record operational parameters—including vacuum level (measured externally), filtration duration, volume processed, and membrane lot numbers—in accordance with GLP/GMP Annex 11 expectations. ROCKER provides traceable calibration certificates for optional pressure gauges and certified reference membranes upon request.

Applications

• Clarification of clarified lysates and harvest supernatants prior to chromatography
• Solvent exchange and desalting of oligonucleotides and synthetic peptides
• Pre-filtration of media and reagents for single-use bioreactor systems
• Removal of precipitated aggregates during monoclonal antibody formulation
• Continuous diafiltration in pilot-scale downstream processing
• Environmental water sample concentration for microbial analysis (EPA Method 1623)

FAQ

Can the Stream system be used under positive pressure?
No—this system is designed exclusively for gravity-fed or vacuum-assisted operation. Positive pressure may compromise seal integrity and cause uncontrolled overflow.
Is the ground-glass frit replaceable?
Yes—ROCKER supplies spare fritted discs (catalog #167230-03 and #167230-11) with calibrated porosity (10–15 µm) and certified flatness per ISO 4787.
What vacuum level is recommended for optimal performance?
A stable vacuum of −0.7 to −0.85 bar is ideal for most aqueous solutions; higher differentials may accelerate membrane fouling without improving throughput.
Are replacement membranes supplied by ROCKER?
ROCKER does not manufacture membranes but provides compatibility guidance and distributes certified membranes from leading vendors (e.g., Pall, Sartorius, Whatman) with full lot traceability.
Does the system support inline pH or conductivity monitoring?
No—however, standard 6 mm tubing ports are provided at inlet/outlet positions to integrate third-party inline sensors compliant with ASTM D1129 terminology.