EDI Purified Water System for Bio-medicine

In bio-medicine and biotechnology, an EDI (Electrodeionization) purified water system is a specialized technology used to generate high-purity water that meets the stringent requirements of the US Pharmacopeia (USP) or European Pharmacopeia (EP).
While standard deionization relies on chemical tanks that must be replaced or regenerated with acid, EDI uses electricity to continuously produce a stable stream of water with ultra-low conductivity, making it ideal for the highly sensitive and sterile environments of bio-medicine.

Bio-medical applications, such as the production of vaccines, monoclonal antibodies, and sterile injectables, require water that is chemically and biologically "quiet".

• EDI provides a consistent, high-purity flow without the "ionic leakage" that can occur at the end of a traditional resin bed's cycle.
• Because EDI operates at high voltages and utilizes specialized membranes, it helps inhibit the growth of bacteria and biofilms that are common in traditional stagnant resin beds.
• Chemical-Free Safety: By eliminating the need for bulk acid and caustic soda for regeneration, EDI removes the risk of chemical cross-contamination in the production facility.
• When combined with Reverse Osmosis (RO), EDI is highly effective at maintaining Total Organic Carbon (TOC) levels below 500 ppb, ensuring the water does not interfere with the stability of biological formulas.

A standalone EDI unit is rarely used alone; it is typically the "polishing" stage in a multi-barrier system designed for maximum safety:

1. Pre-Treatment: Softening and carbon filtration remove hardness and chlorine to prevent scaling and chemical damage to the downstream membranes.
2. Double-Pass Reverse Osmosis (RO): The water is forced through two sets of RO membranes, removing 99.8% of minerals, bacteria, and pyrogens (endotoxins).
3. The permeate from the RO stage enters the EDI, where an electric field strips the remaining trace ions to reach a resistivity of 10–15 M$\Omega$·cm.
4. A 254nm UV lamp destroys any remaining organics, while an Ultrafiltration (UF) membrane acts as a final physical barrier to ensure the water is "apyrogenic" (free of fever-inducing endotoxins).

It improves ion/organics removal and gives EDI a cleaner, more stable feed-helpful for consistent conductivity and lower microbial risk.

• Conductivity: often ~0.05–0.2 µS/cm (design and feed dependent)
• Resistivity: commonly 5–18 MΩ·cm

Final specs are set by your URS (User Requirement Specification) and compendial targets.

Watch-outs: EDI needs good RO feed (low hardness, low silica scaling risk, low organics, no chlorine).

3. : PW only or PW + feed to WFI
5. SS316L sanitary (electropolish if required), hygienic fittings

a.We provide full technical support and after equipment installation.
b.We help to train operator of the system. And detailed operating manual is provided.
c.7*24 hours phone assistance on technical support.
d.We provide consumable and spare parts in the long-term for cost price.

a.All systems delivered to customers are carefully examined and pipe tested.
b.All systems enjoy 12 MONTHS warranty ever since B/L date.

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