EDI Module, Deepflow CYTTEDI35 Ultra-Pure Water System (35 L/h)
| Brand | Deepflow |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | CYTTEDI35 |
| Flow Rate | 35 L/h |
| Technology | Electrodeionization (EDI) |
| Output Water Quality | ≥18.2 MΩ·cm @ 25°C, <5 ppb Total Organic Carbon (TOC), <0.1 CFU/mL Bacterial Count |
| Power Supply | 220 VAC, 50 Hz |
| Dimensions (W×D×H) | 450 × 400 × 600 mm |
| Weight | 28 kg |
| Operating Temperature | 5–35 °C |
| Inlet Water Requirement | RO permeate (≤10 µS/cm, ≤1 ppm SiO₂, <0.1 ppm Fe/Mn, <0.05 ppm Cl₂) |
| Certifications | CE, ISO 9001, GB/T 17218-1998 (Drinking Water Treatment Materials) |
Overview
The Deepflow CYTTEDI35 EDI Module is a continuous electrodeionization unit engineered for integration into laboratory-scale ultra-pure water systems. It replaces traditional mixed-bed ion exchange resins by combining ion-selective membranes, ion-exchange media, and direct current electric fields to achieve stable, chemical-free polishing of reverse osmosis (RO) permeate into Type I ultrapure water (ASTM D1193-20). Unlike batch-mode deionization, the CYTTEDI35 operates continuously with no regeneration downtime, delivering consistent resistivity ≥18.2 MΩ·cm at 25 °C while maintaining TOC levels below 5 ppb and microbial counts under 0.1 CFU/mL—meeting critical requirements for HPLC mobile phase preparation, trace metal analysis, cell culture media formulation, and semiconductor wafer rinsing.
Key Features
- Continuous electrochemical deionization without acid/base regeneration or resin replacement cycles
- Integrated stack design with alternating cation- and anion-selective membranes and heterogeneous ion-exchange resin fillers
- Automated polarity reversal and current-controlled operation to prevent scaling and fouling under variable feedwater conductivity (1–10 µS/cm)
- Real-time monitoring of stack voltage, current draw, product water resistivity, and flow rate via built-in digital interface
- Modular footprint optimized for retrofitting into existing Deepflow or third-party RO/UPW skids (450 × 400 × 600 mm)
- Low energy consumption: typical power draw ≤120 W at nominal 35 L/h output
- Stainless steel 316L housing with EPDM gasketing; compliant with USP Class VI and FDA 21 CFR 177.2600 for wetted materials
Sample Compatibility & Compliance
The CYTTEDI35 is validated for use with RO feedwater meeting ISO 3696:1987 Grade 3 specifications (conductivity ≤10 µS/cm) and low silica (<1 ppm), oxidant-free (<0.05 ppm free chlorine), and low transition metal content (<0.1 ppm Fe/Mn). It is not designed for direct connection to municipal tap water or high-hardness groundwater. The module complies with GB/T 17218–1998 (Hygienic Safety Evaluation of Drinking Water Treatment Materials), CE marking per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD), and ISO 9001:2015 quality management system certification. For GLP/GMP environments, optional audit-trail-enabled data logging supports 21 CFR Part 11 compliance when paired with Deepflow’s AquaLog™ SCADA platform.
Software & Data Management
While the CYTTEDI35 operates as a standalone hardware module, its digital interface provides RS-485 Modbus RTU output for seamless integration into centralized water system controllers. When deployed with Deepflow’s AquaLog™ software suite (v4.2+), users gain access to time-stamped event logs—including stack voltage anomalies, flow deviation alerts, and resistivity drift trends—exportable in CSV or PDF for internal QA review. All operational parameters are stored with timestamped metadata, enabling full traceability required for ISO/IEC 17025 accredited laboratories. Firmware updates are delivered via secure USB interface with cryptographic signature verification.
Applications
- HPLC and UHPLC mobile phase and blank preparation where ionic contamination must remain below detection limits
- ICP-MS and GF-AAS sample dilution and standard preparation requiring sub-ppt metal background
- Preparation of electrophysiology buffers and stem cell culture media sensitive to endotoxin and organic leachables
- Final rinse water for photomask cleaning and microfluidic device fabrication
- Feedwater polishing for laboratory steam generators and autoclave reservoirs
- Supporting ISO 14644-1 Class 5 cleanroom humidification systems requiring particle- and ion-free vapor
FAQ
What inlet water quality is required for optimal CYTTEDI35 performance?
RO permeate with conductivity ≤10 µS/cm, silica ≤1 ppm, free chlorine <0.05 ppm, and iron/manganese <0.1 ppm is mandatory. Pre-treatment with dual-stage RO or RO + degasifier is recommended for high-silica feed sources.
Can the CYTTEDI35 be operated in recirculation mode?
Yes—when integrated with a recirculating loop and UV oxidation (185/254 nm), the module maintains long-term resistivity stability and suppresses biofilm formation in distribution piping.
Is validation documentation available for pharmaceutical use?
Deepflow provides IQ/OQ protocol templates aligned with ASTM E2500-13 and Annex 15 of the EU GMP Guide; PQ support requires site-specific challenge testing with user-defined acceptance criteria.
What maintenance intervals are recommended?
No routine resin replacement is needed. Annual inspection of membrane integrity, electrode corrosion status, and gasket compression is advised. Cleaning-in-place (CIP) with citric acid (2% w/w, pH 2.5) is performed only if voltage rise exceeds 15% over baseline.
Does the module comply with USP Water for Pharmaceutical Purposes?
When integrated into a fully qualified system meeting all upstream and distribution requirements, the CYTTEDI35 contributes to compliance with USP specifications for Purified Water and Water for Injection (WFI) feed polishing—subject to system-level validation.
