Manufacturer: Suzhou Purple Core Instant Purification Technology Co.,Ltd. | CE: DPCW/01068/06/KA/26 | EPA Est. No. 105777-CHN-1
In-line UVC post-treatment · from the manufacturer

UVC-LED water disinfection modules for RO and under-sink systems

Compact 1–3 GPM modules for water purifiers and OEM systems — a mercury-free UV-C stage spliced into a line that is already treating water, after the storage tank and before the faucet. It acts on water that has already been filtered, so it is a post-treatment component and not a stand-alone water purifier: it removes nothing, and it has to sit after the stages that do the removing.

CE conformity certificate DPCW/01068/06/KA/26 EPA Establishment No. 105777-CHN-1 Mercury-free UV-C · 1 GPM & 3 GPM · flow-actuated
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Straight-on view of the SKWEIT® ZXSJ-UVC-1GPM in-line UVC module, showing the stainless steel housing, the 1/4-inch quick-connect fitting and the product label carrying the model number, the manufacturer and the EPA establishment registration number
Where the unit sits — and what it is not
Where the in-line UV unit sits in a treatment train Five stages in order from left to right: source water from mains or a well, pre-treatment, a reverse osmosis membrane as the removal stage, an in-line ultraviolet post-treatment unit after the storage tank, and the point of use at the faucet. A note records that the unit treats water that has already been purified, that it sits on the permeate line after the tank and before the faucet, and that it is a component rather than the purifier. Source water mains or well Pre-treatment sediment · carbon RO membrane the removal stage UV post-treatment in-line · after the tank Point of use the faucet filtered water — already treated upstream The unit sits on the permeate line, after the storage tank and before the faucet. It treats water that has already been purified — it is not the purifier. What this unit is An in-line ultraviolet post-treatment component. It inactivates micro-organisms in water that has already been filtered, and it removes nothing dissolved.

This unit is an in-line UV post-treatment component for RO and under-sink systems. It is not a stand-alone water purifier, and it removes nothing dissolved — filtration happens upstream of it.

Why this design

Three things that decide whether a module fits

Mercury-free UVC-LED

A solid-state UV-C light source rather than a mercury lamp.

Compact integration

Built for water purifiers and OEM systems — sized to go on the line inside the appliance rather than beside it.

1–3 GPM flow options

Two rated flows, so the module is chosen to the draw of the line it protects.

The series

Two models, chosen by the draw

Straight-on view of the SKWEIT® ZXSJ-UVC-1GPM in-line UVC module with 1/4-inch quick-connect fittings

ZXSJ-UVC-1GPM

1 GPM (4 LPM) · 1/4-inch quick-connect fittings

Compact point-of-use disinfection for a single under-sink drinking-water line — one domestic RO system feeding one faucet.

View the 1 GPM model
Straight-on view of the SKWEIT® ZXSJ-UVC-3GPM in-line UVC module with 3/8-inch quick-connect fittings

ZXSJ-UVC-3GPM

3 GPM (11.4 LPM) · 3/8-inch quick-connect fittings

Higher-flow disinfection for a line serving more than one outlet, or for a system built around a larger draw.

View the 3 GPM model
What the number to match actually is

The figure to size to is the peak draw of the line being protected — not the system's rated output and not the mains flow. Where more than one faucet can run at once, the figure to use is the one that can occur simultaneously. Sizing is worked through on the under-sink UV page; different angles, the three indicator states and the full specification table are on the product pages.

The process

How UVC-LED water disinfection works

  1. Water enters the chamber on the treated-water line.
  2. The UVC-LED lamp irradiates the water as it passes.
  3. Treated water leaves the module toward the point of use.
Nothing is added, and nothing is left behind

The light source stays outside the water path. An ultraviolet stage leaves no residual in the water, so it acts at the moment of use and protects nothing downstream of the chamber — which is why the position on the line is part of the specification and not a layout preference. The technology overview sets out the four variables that decide whether the stage works at all.

How an in-line UVC-LED module treats water Water flows from left to right along a channel. Inside the channel a quartz sleeve holds the UVC-LED lamp, which sits outside the water path. Ultraviolet light from the lamp irradiates the water as it passes, and treated water leaves on the right toward the point of use. UVC-LED lamp held in a quartz sleeve, outside the water path water in quartz sleeve treated water out
Three steps, one pass. The module holds no media and adds no chemical: what it does depends on the water reaching the lamp and on where the module sits.
Where it goes

Under-sink integration example

In-line UVC module installed inside an under-sink reverse-osmosis system, alongside the filtration stages and the storage tank
The module installed under a sink, on the permeate line after the filtration stages and the storage tank.

A compact 1 GPM module goes onto the permeate line of an under-sink RO system — after the filtration stages and the storage tank, immediately before the kitchen faucet. Everything upstream of the module is a condition that can be corrected; everything downstream of it would undo the barrier it creates.

Filtration stages 1 GPM UVC module Kitchen faucet

Two positions that look right and are not

Fitting the module between the membrane and the storage tank puts the barrier upstream of the tank. Fitting it before the pre-filter treats water outside the module's published limits. Both install cleanly and both leave the tap no different.

Applications

Designed for water-system integration

An in-line module is specified by the line it protects rather than by the building it sits in. The applications below are the ones the series is supplied for; the specification question is always the same three figures — flow, connection size and the space available on the line.

Water purifiers Drinking-water systems Dispensers OEM equipment

Credentials, stated precisely

Certifications and technical documents

Certificates and test reports are available for reference. What is held, which models each document covers, and what is deliberately not claimed is set out in full on the certifications page, with the reference numbers as they appear on the certificates themselves.

View certifications   Request technical documents

What is not claimed

No microbiological performance rating, no log-reduction claim, no dose value and no contaminant-reduction certification is held or asserted on this site. Where a page would need a number the manufacturer has not published, the page says so instead of supplying one.

Two credentials, two markets — and the rest
Certification and registration held, by target market Three columns. For North America, the EPA Establishment registration 105777-CHN-1 is held: a facility registration held by the manufacturer, not a product certification, and with no pre-market review of the product. For the European Union, a CE conformity certificate DPCW/01068/06/KA/26 is held, issued for the models ZXSJ-UVC-1GPM and ZXSJ-UVC-3GPM. For other markets, nothing is asserted: no conformity assessment is claimed, and where a market requires an evidenced lifetime claim the qualification has to run under that market's own programme. What is held, for which market — and what is deliberately not claimed North America EPA Establishment No. 105777-CHN-1 A facility registration held by the manufacturer. It is not a product certification, and there is no pre-market review of the product. European Union CE conformity certificate DPCW/01068/06/KA/26 Issued for the models ZXSJ-UVC-1GPM and ZXSJ-UVC-3GPM, by INTERCERT Global (Warsaw). Not asserted elsewhere Nothing is claimed for other markets No conformity assessment is asserted for any other jurisdiction. Where a market requires an evidenced lifetime claim, the qualification runs under that market's own programme. A registration is not a certification, and neither document is a statement about how the productperforms. Ask which market you are selling into before a quotation is built around it.

Both documents are model-anchored rather than brand-anchored: they are held for the two model designations above, which is what a buyer's compliance file has to match.

Quick answers

Three questions that come up first

What flow rates are available?

Two, at present: 1 GPM (4 LPM) and 3 GPM (11.4 LPM). Both are in-line units for a treated-water line, and the configuration of each is set out on its product page.

Can the module be integrated into an existing system?

Yes. Send the flow rate, the connection size and the space available around the line, and the suitable model can be confirmed from those three.

How can I request technical documents?

Through the contact page, with the model and the application. The series datasheets are also published on this site.

The full FAQ covers feed-water limits, servicing, what a dose figure does and does not mean, and what the certifications do not cover.

Find the right UVC-LED module for your system

Send the flow rate, the connection size and the application. From those three the suitable configuration can usually be identified in one exchange.

  • Models: ZXSJ-UVC-1GPM (1 GPM / 4 LPM) ｜ ZXSJ-UVC-3GPM (3 GPM / 11.4 LPM)
  • Credential: CE conformity certificate DPCW/01068/06/KA/26 · EPA Establishment No. 105777-CHN-1 (facility registration)
  • Scope: in-line UVC post-treatment for water that has already been filtered
  • Samples: available for evaluation before a volume commitment

Send an enquiry

Typical response within one business day.

This form is not yet connected to a mail service — the enquiry endpoint will be wired up at launch. Until then, write to sales@skweit.cn or through the contact page.

Sources and scope

5 sources
  1. Product role, rated flows, connection sizes, feed-water limits and servicing requirements: SKWEIT® UV Water Sterilizer instruction manual, revision 01.03, and the accompanying product parameter table (models ZXSJ-UVC-1GPM and ZXSJ-UVC-3GPM). Cited for: the accurate product description, the rated flows, the fittings, and the statement that the unit is a post-treatment component for pre-filtered water.
  2. Placement rule — the stage belonging immediately before the point of use, after any storage tank: attributed to the manufacturer's installation documentation and to the behaviour of stored, unchlorinated water in contact with wetted surfaces. Cited for: the statement that a barrier placed upstream of a storage tank cannot protect the water after it.
  3. Certification status: CE conformity certificate DPCW/01068/06/KA/26 (INTERCERT Global), certificate holder Suzhou Purple Core Instant Purification Technology Co.,Ltd.; EPA Establishment registration No. 105777-CHN-1, a facility registration and not a product certification; SKWEIT® United States trademark registration 8,213,072, International Class 11. No contaminant reduction or microbiological performance certification is held or claimed, and no performance figure — no inactivation rate, log reduction or dose value — is asserted on this page.
  4. Lamp life, where it appears on this site: manufacturer design rating of 15,000 hours at not less than 60 per cent of initial output, per the supplier reliability documentation. Cited as a design rating — not a validated service-life claim. The service interval and the reason it is not derived from that figure are set out on the replacement schedule page.
  5. Manufacturing capability — four assembly lines, 430 m² of workshop and storage space, and 3,000 units per month available to this product line: the manufacturer's own figures, September 2026. Cited as the scale of the operation behind the product. They are not third-party audited, and they are not a statement of product performance or a commitment of volume to any order.

Document control. Published 30 September 2026 ｜ Reviewed by the SKWEIT® technical documentation team. Author: SKWEIT® technical documentation (Suzhou Purple Core Instant Purification Technology Co.,Ltd.). Research cut-off for cited sources: September 2026.

Scope note. This site describes in-line UVC post-treatment components for water that has already been filtered, the positions in which they belong and the conditions they require. It is not an installation manual — the manual supplied with the unit governs, including the feed-water limits and the commissioning sequence. It does not diagnose a specific system or supply and it is not a substitute for laboratory testing. EPA Establishment registration is a facility registration and is not a product certification.