Precision filters for Coolant Distribution Units in AI and HPC data centers — built on twelve years of SS316L industrial filtration and engineered to the OCP Liquid-to-Liquid CDU guidelines. Complete coverage from FWS facility-water inlet to TCS secondary-loop protection and continuous side-stream polishing. Engineering samples and full ΔP / Beta-ratio test-data packages available now.
Brother Filtration has built industrial filtration since 2014 — SS316L welded housings, pleated mesh and wedge-wire elements shipped to clients in 79+ countries. We are now adapting that proven engineering to Coolant Distribution Units for AI and HPC data centers, designed to the OCP Liquid-to-Liquid CDU guidelines referenced by hyperscale operators and Meta Green Cooling. Our offering covers every filtration position in the CDU loop — from FWS facility-water inlet to TCS secondary-loop protection and continuous side-stream polishing — and ships with the test-data package CDU engineers need to qualify it.
OCP requires filtration at two positions — primary on the FWS inlet and secondary on the TCS loop — with side-stream polishing recommended as best practice. Each maps to a dedicated Brother filter, plus a commissioning flush for first-startup use.
FWS Primary · TCS Secondary · TCS Side-Stream Bypass
Loop schematic — flow direction shown by arrows. Primary protects the heat exchanger; secondary protects cold plates; side-stream continuously polishes 5–10% bypass flow.
Filters for every position in the CDU loop, designed to the OCP Liquid-to-Liquid guidelines — SS316L wetted materials throughout, rated to 100 psi system pressure, and tested for compatibility with water-based and propylene-glycol coolants. Each ships with the validation data your engineering team needs to qualify it.
Position-by-position engineering specifications, OCP alignment and recommended ratings.
| Parameter | Primary · FWS Strainer | Secondary · TCS Pleated | Side-Stream · Polisher |
|---|---|---|---|
| Position | FWS facility water inlet | TCS server-side main loop | TCS bypass · continuous |
| OCP requirement | ≤ 200 µm (Required) | 25 – 50 µm (Required) | 0.2 – 5 µm (Recommended) |
| Filtration rating | 150 / 200 / 250 µm | 25 µm / 50 µm | 0.2 / 1 / 5 µm |
| Media / material | SS316L wedge-wire | SS316L pleated mesh | PES / PVDF membrane |
| Max pressure | 100 psi | 100 psi | 100 psi |
| Connection | Victaulic / Flanged | Tri-clamp / Victaulic | Tri-clamp · 10"/20" |
| Design / feature | Washable & reusable | Hot-swap + ΔP port | 5–10% bypass, no extra pump |
| Coolant compatibility | Water · PG · EG | DI water · 25–30% PG | Water · glycol (+10–30% ΔP) |
| Documentation | EN 10204 3.1 + ASME | EN 10204 3.1 + ASME | EN 10204 3.1 |
Filters designed to the OCP Liquid-to-Liquid CDU filtration specs, ASME hydrostatic-tested and backed by EN 10204 3.1 material reports. UL, CE / PED and OCP Inspired registration are in active qualification through 2026. Compatibility tested across the full coolant stack used in modern hyperscale CDUs.
SS316L welding, pleated mesh and wedge-wire built in-house, shipped to 79+ countries on an ISO 9001 system — now adapted to CDU.
We don't just ship a filter. ΔP curves, ISO 16889 Beta-ratio, ICP-MS and TOC data come with it — cutting validation cost up to 30%.
FWS strainers, TCS precision mesh, side-stream polishing and commissioning flush — every position from one engineering team.
Dedicated CDU filter lines with rapid sample programs, OEM and private-label options, and flexible MOQ for early design-in partners.
Pick your CDU format and coolant — we'll map the recommended filter for each position, then send it straight to engineering.
Selections update the recommendation instantly.
Frequently asked questions from CDU manufacturers, hyperscale operators and data-center engineers evaluating liquid-cooling filtration for AI & HPC workloads.
A CDU (Coolant Distribution Unit) filter keeps coolant clean as it circulates between the facility water supply (FWS) and the technology cooling system (TCS) that feeds GPU and CPU cold plates.
In AI and HPC data centers, even sub-millimeter particulates can clog the micro-channels inside cold plates and trigger thermal throttling or hardware failure. OCP Liquid-to-Liquid CDUs require filtration at two positions — primary on the FWS inlet and secondary on the TCS loop — with continuous side-stream polishing recommended as best practice.
25–50 µm is the rating window adopted by OCP Liquid-to-Liquid and Meta Green Cooling because it provides adequate protection for cold-plate micro-channels (typically 100–300 µm wide) while keeping pressure drop manageable at the high flow rates required by AI racks.
25 µm is recommended for in-rack CDUs with denser cold plates; 50 µm is preferred for in-row CDUs where a lower ΔP is more important. Both ratings ship in Brother's hot-swap TCS pleated filter housing.
A hot-swap CDU filter housing has dual cartridge chambers and an isolation valve that lets operators replace one cartridge while the other continues to carry full flow. The CDU never has to shut down for filter maintenance — critical for AI training jobs that cannot tolerate downtime.
OCP Liquid-to-Liquid lists hot-swap as best practice. Brother's hot-swap TCS pleated filter is built with an integrated ΔP monitoring port so the CDU controller can flag clog conditions before pressure drop affects pump head.
Yes. All Brother CDU filters use SS316L wetted materials and are verified compatible with DI water, 25% propylene glycol (PG), 30% ethylene glycol (EG), Clariant Antifrogen and Dynalene HC.
Pressure drop for the side-stream membrane cartridges increases 10–30% when running glycol mixes versus pure water at the same flow rate — sizing curves and chemical compatibility data are provided on request.
SS316L is the industry-preferred grade for CDU wetted components because it resists pitting and crevice corrosion from glycol-based coolants, holds up to 100 psi system pressure with a 10+ year service life, and is fully traceable via EN 10204 3.1 material test reports.
Lower-grade stainless and brass fittings can shed metal ions into the coolant loop, which then deposit inside cold-plate micro-channels and increase thermal resistance over time.
Every CDU filter ships with ASME B31.1 / B31.3 hydrostatic pressure test results, EN 10204 3.1 material test reports (MTR), and ΔP curves, ISO 16889 Beta-ratio, ICP-MS and TOC test data.
Quality is ISO 9001 certified; materials are RoHS and REACH compliant. UL Listing, CE / PED and OCP Inspired registration are in active qualification through 2026. The full document package is available within 24 hours of inquiry.
Yes. The Brother OEM Program supports custom dimensions, interface connections (Victaulic, flanged, Tri-clamp, NPT or custom), private branding and EN 10204 3.1 documentation packages tailored to each CDU manufacturer.
MOQs are flexible and typical lead time for engineering samples is 4–6 weeks. White-label options and dedicated CDU production lines mean inventory programs can be set up alongside ongoing manufacturing.
Whether you're a CDU manufacturer building your next-gen product line or a data center operator evaluating filtration upgrades — our engineering team is ready with samples, datasheets, pressure-drop curves, and material documentation.
Our CDU specialist replies within 24 hours with samples, datasheets and ΔP curves.
CDU Filtration datasheet package — ΔP curves, ISO 16889 Beta-ratio and EN 10204 3.1 material data. Enter your email and we'll send the PDF within 24 hours.
Check your inbox for the CDU datasheet package. (Demo — no email is actually sent.)
