20,000+ m² ISO 9001 quality-managed facility in Haining, Zhejiang — dedicated lines for PP melt-blown, sintered carbon block, UF/RO membrane assembly and dispenser SMT.
Our state-of-the-art manufacturing center in Yuanhua Town, Haining, Zhejiang Province operates dedicated lines for every product family — ensuring traceability, quality and on-time delivery for global wholesale orders.

Automated extrusion · 24/7 production · Virgin PP resin only

Sintered carbon · Coconut-shell media · selected NSF/ANSI test options

T33, mineralization & post-carbon cartridges

100% hydrostatic-tested at 1.5× rated pressure
For carbon block filter orders, Yuchen Water controls formulation design, mixing, filling, pressure forming, sintering, cutting and packing. This workshop procedure keeps pore distribution, strength, chlorine reduction performance and OEM dimensions stable for B2B buyers.
| Procedure | Technology | QC key points |
|---|---|---|
| Design of ingredients | Ingredients are designed after raw material QC and confirmed against the order formula. | Consistent weight and media ratio for each piece. |
| Mixing | Large automatic mixers can blend more than 500 kg of raw material in one batch. | Consistent density in each carbon block. |
| Filling | Automatic filling machines load carbon media into molds with controlled volume. | Stable weight for each piece. |
| Pressure forming | Semi-automatic pressing gives stable pressure during block forming. | Higher density and more even pore structure. |
| Sintering | Semi-automatic sintering follows the approved time and temperature curve. | Consistent sintering time, temperature and bond strength. |
| Mold unloading | Semi-automatic unloading reduces damage after sintering. | Higher finished product yield. |
| Cutting | Semi-automatic cutting keeps cartridge length consistent. | Typical tolerance can be controlled around 0.2 mm. |
| Packing | Manual inspection with semi-vacuum packing or export cartons. | Products are protected for warehouse and export shipping. |
Before mass production, each order is sampled according to company standards or customer requirements. The formula, sintering time, temperature and process parameters are confirmed first. Samples can be checked by aeration testing and repeated pressurization cycle testing so that pore distribution, mechanical strength, chlorine reduction, taste and odor removal performance stay within the agreed specification.
During production, operators monitor the key equipment parameters, including temperature, frequency, pressure and filling weight. These controls help the carbon block line run steadily and keep each batch suitable for OEM water filter cartridge orders.
Finished cartridges are inspected by batch sampling or full inspection according to the order requirement. QC checks look for visible defects, cracks, abnormal weight, unstable pressure drop and filtration performance issues before packing.
Available nominal filtration ratings include 0.5, 1, 5 and 10 microns with high dirt holding capacity. Coconut shell activated carbon blocks are designed to reduce chlorine, taste, odor and VOCs, keep low pressure drop, avoid carbon fines release and offer a cost-effective alternative to extruded carbon block filters.
For projects that require supporting documents, selected materials or products can be validated or tested according to WQA and NSF/ANSI 42 material requirements when applicable and confirmed for the order. OEM clients can request custom carbon blocks with different OD, ID, length, shapes, logo labels and packaging. Coconut shell activated carbon options can be supplied with iodine value above 1000 and methylene blue adsorption above 120 when specified.
Multi-layer thermally-bonded sediment filters: 0.5 to 50 µm. Capacity: 200,000 pcs/month.
CTO blocks pressed from coconut-shell or coal carbon: 1, 5, 10 µm.
TFC polyamide rolling line: 50, 75, 100, 200, 400, 600 GPD elements.
PVC & PES membrane potting in clean room. 0.01 µm filtration.
Wall-mounted, vertical & desktop dispensers. ISO 9001 SMT line.
Flow rate, pressure drop, salt rejection, microbial testing.