The ZXSJ-UVC series is two in-line ultraviolet units that differ in one practical way: how much water they are rated to treat. The 1 GPM (4 LPM) model takes 1/4" quick-connect fittings and suits a single drinking-water outlet; the 3 GPM (11.4 LPM) model takes 3/8" and suits a multi-outlet or higher-demand draw. Both are post-treatment units — fitted on the treated line of an RO or under-sink system, after any storage tank and before the point of use. Neither is a stand-alone water purifier.
Both units do the same thing at the same position on the line. The choice between them is a flow rating and a fitting size — not a difference in what the unit does.
Rated at 1 GPM (4 LPM) with 1/4" push-fit ports on both ends, which is the tubing size most under-sink RO sets already use. Typical application: a single under-sink RO tap and point-of-use drinking water. It is the model covered by the CE certificate and the EPA establishment registration.
Rated at 3 GPM (11.4 LPM) with 3/8" push-fit ports, for installations where the draw at the point of use is higher or more than one outlet is fed from the same treated line. Same housing, same operation, larger bore.
| Parameter | ZXSJ-UVC-1GPM | ZXSJ-UVC-3GPM |
|---|---|---|
| Rated flow | 1 GPM (4 LPM) | 3 GPM (11.4 LPM) |
| Water pipe fitting | 1/4" quick-connect (push-fit), both ports | 3/8" quick-connect (push-fit), both ports |
| Typical application | Single under-sink RO tap, point-of-use drinking water | Multi-outlet or higher-demand installations |
Everything else in the series is shared: the housing material, the operating principle, the indicator, the power adapter, the mounting position and the feed-water limits. The full parameter list, including the values that are not published and why, is on the series data sheet.
Flow at the point of use
A single drinking-water tap and a branch feeding several outlets are not the same duty. Where the figure is unknown, it is measured at the outlet rather than assumed from the supply pressure.
Tubing already in the run
The unit is fitted into a line that exists. A 1/4" run and a 3/8" run are served by different models, and adapting one to the other introduces a joint that did not need to be there.
What the unit will sit behind
Both models assume pre-filtered drinking water and depend on the upstream stages meeting the feed-water limits. Fitting either model behind an overdue pre-filter is the most common way an installation ends up outside its conditions of use.
Full values: series data sheet. Fitting sequence: installation guide. The conditions the upstream system has to meet: feed-water limits and warranty. Where each case installs: solutions by installation.
Send the tubing size already in the run, the draw at the point of use, and what sits in front of the unit. Those three select the model; everything else in the series is shared.
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