# Inline Shower Filters and Multi-Stage Filter Cartridges

Source: https://www.ningboware.com/shower-heads/inline-shower-filters/
Publisher: Cixi Zhonghe Sanitary Appliance Factory (ZHONGHE), Cixi, Ningbo, Zhejiang, China. Contact: steven@ningboware.com
Updated: 2026-09-03

An inline shower filter is a housing that sits between the shower arm or hose and the head, so a filter can be added without replacing the shower. ZHONGHE, a shower head factory in Cixi, Ningbo, China, lists 6 filter cartridges including a transparent PP housing with male and female threaded ends, alongside 28 filter shower heads that carry the media inside the handle.

Also called: shower filter for hard water; 15 stage shower filter; shower head filter attachment; shower water filter; universal shower filter; chlorine shower filter; shower filter replacement cartridge; 过滤花洒

Item | Detail
--- | ---
Catalog cartridges | 6 listings: Activated Carbon Filter, PP Filter, PP Filter-2, Mineral Stone Beads Filter, Mineral Stone Beads Filter-2, Magnet Filter
Inline format | The PP Filter is photographed as a clear cylindrical housing with a male thread at one end and a female nut at the other, so it fits between hose and head
ACF performance | In SGS testing to GB/T 5750.11-2023, ZHONGHE's activated carbon fiber showed 99.5% free-chlorine removal at the start of flow; separate third-party tests showed over 96.8% initially and 90.6% after 5 tons
Calcium sulfite balls | Passed drinking-water-grade hygiene testing across 16 items and RoHS screening, so they suit mixed hot-water shower use
Media types | Activated carbon fiber, PP cotton, mineral stone beads (single and three-section), and a magnetic insert
What 15 stage means | A marketing count of media layers in one cartridge, not 15 separate housings; the honest specification names the media and the tested parameter
Refills | Cartridges are consumables and are supplied as refill packs alongside the heads, so a retail program can carry both SKUs

## Inline housing or filter handle

There are two ways to put media in a shower. The first is a filter shower head, where the cartridge sits in a transparent handle: ZHONGHE lists 28 of these, and the media is visible through the plastic, which is why they photograph well for retail. The second is an inline filter, a short housing threaded at both ends that goes between the arm or hose and whatever head the customer already owns. The catalog's PP Filter is described exactly that way, with a male thread at one end and a larger female nut at the other.

The inline route is what buyers search for when they want to keep an existing shower. It also stacks: the PP Filter-2 photo shows a PP cotton cartridge inside a transparent handle with a second inline housing screwed to the handle base and a chrome nut joining it to a metal hose. Confirm the exact threads and whether the housing is orderable on its own before building a listing around it.

## What a multi-stage cartridge actually contains

The phrase 15 stage is a count of media layers inside one cartridge, not a count of housings. The Mineral Stone Beads Filter-2 in the catalog is a clear tube divided into three visible bead sections, dark grey, white and orange-brown, which a marketing sheet could describe as three stages. Add a PP cotton layer, an activated carbon layer, and separate bead types, and the number climbs without the water passing through anything new.

The specification that is worth writing down instead is the media and the tested parameter. ZHONGHE's activated carbon fiber has SGS test data against free chlorine: 99.5% removal at the start of flow under GB/T 5750.11-2023, with separate third-party tests showing over 96.8% initially and 90.6% after 5 tons. The calcium sulfite balls have passed hygiene testing across 16 items and RoHS screening, which matters because shower water is hot. Nothing in the catalog is tested for or claimed against heavy metals, bacteria or skin benefits.

## Refill logic and how to specify a filter program

A filter product is two SKUs from the start: the unit and the refill. Decide the refill interval you will print, decide whether the refill is a bare cartridge or a retail multipack, and match the packaging to a shelf. Because performance falls with use, an honest interval is stated in tons of water or months at a stated household, not as a fixed promise, and the ACF figures above show why: the same media measured 99.5% at the start and 90.6% after 5 tons.

For an RFQ, state the media you want, whether the format is an inline housing or a cartridge for a filter handle, the thread standard for the destination market, the refill pack format, and the quantity. MOQ discussions normally start from about 2,000 units.

## FAQ

### Do you make an inline shower filter that fits any shower head?

The catalog's PP Filter is photographed as a clear inline housing with a male thread at one end and a female nut at the other, which is the fitting pattern for going between a hose and a hand shower or a shower arm. Confirm the exact thread sizes and whether it is orderable as a stand-alone item for your market before listing it as universal.

### Is a 15 stage shower filter really 15 filters?

No. It counts media layers inside one cartridge. A three-section bead tube plus a PP cotton layer plus a carbon layer can be described as five or more stages with the water still passing through a single housing. Specify the media and the tested parameter instead, which is what a compliance reviewer will ask for.

### What chlorine reduction can you document?

For the activated carbon fiber media: 99.5% free-chlorine removal at the start of flow in SGS testing to GB/T 5750.11-2023, with separate third-party tests showing over 96.8% initially and 90.6% after 5 tons. Results vary with water quality, and the media is a consumable.

### Can you supply the cartridges as a refill SKU?

Yes. The 6 cartridge listings are supplied alongside the shower heads, so a program can carry the head and the refill as separate SKUs. State the refill pack format and the interval you intend to print, and MOQ discussions normally start from about 2,000 units.

## Related pages

- https://www.ningboware.com/shower-heads/replacement-shower-filter-cartridges/
- https://www.ningboware.com/shower-heads/chlorine-hard-water-filter-shower-heads/
- https://www.ningboware.com/shower-heads/activated-carbon-filter-shower-heads/
- https://www.ningboware.com/shower-heads/pp-cotton-sediment-filter-shower-heads/
- https://www.ningboware.com/products/replacement-filters-accessories/
- https://www.ningboware.com/resources/shower-head-filter-media-types/