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This is a sintered activated carbon rod filter in a Ф38×57 mm format, built from high-iodine coconut shell carbon with an ion-exchange resin core. It filters chlorine, off-tastes, odours and heavy metals such as lead and mercury, and softens water to reduce scaling. It suits household reverse-osmosis systems, water dispensers, refrigerator water filters and commercial coffee machines, and is offered by Ranveth with flexible sizing and OEM/ODM support.
The performance of a carbon block comes from how its media are chosen and arranged, not from a single headline figure. In this rod, high-iodine coconut shell activated carbon provides the adsorption surface for chlorine, colour, odour and volatile organic compounds. A food-grade ion-exchange resin is integrated into the structure to exchange hardness ions and help capture heavy metals. The pairing means one cartridge addresses both taste and scale, which matters where water is hard or chlorine levels vary.
The carbon and resin are formed into a sintered rod with a uniform microporous structure. That structure sets the working balance: open enough for a high initial flow at low pressure drop, tight enough for fine particle retention, and coherent enough that the rod does not shed black carbon fines into the downstream line. A large saturation capacity supports a longer service interval under normal feed conditions. Because the rod can be produced across a range of diameters and lengths, the same media pairing can be tuned to the flow and pressure budget of a given appliance.
| Item | Detail |
|---|---|
| Product name | Carbon block water filter cartridge for water purifiers and refrigerators (CTO filter) |
| Core filtration media | High-iodine coconut shell activated carbon plus food-grade ion-exchange resin |
| Core performance | Softens water and helps prevent scaling; adsorbs chlorine (bleaching powder) and off-colour/odour; captures harmful heavy metals such as lead and mercury |
| Precision and service life | Uniform microporous structure, high initial flow, fine filtration with no black carbon fines; large saturation capacity for long service life |
| Standard size reference (outer diameter × length, mm) | Ф60×130 / Ф62×240 / Ф37.5×75 / Ф38×57 / Ф40×195 / Ф51×127 / Ф32×126 / Ф32×106 |
| Main end applications | Household reverse-osmosis purifiers (pre-filter CTO / post-filter T33), direct-drinking dispensers, built-in filters for side-by-side refrigerators, commercial coffee machines |
| Customisation service | Full OEM/ODM support. Length, diameter and inner/outer diameter ratio can be tooled to the device; end-cap welding customisation available |
| Quality systems | The 20,000 m² production base is ISO 9001 and IATF 16949 certified. Filter media meet strict drinking-water safety standards and are controlled by a national-level CNAS testing centre |
The Ф38×57 format is a compact rod for appliances with limited housing space. Typical positions are the pre-filter CTO stage or post-filter T33 stage of household reverse-osmosis purifiers, where the carbon block protects the membrane from chlorine and polishes taste at the tap. The same construction is used in direct-drinking water dispensers, built-in refrigerator water filters and commercial coffee machines, where stable flow and the absence of carbon fines protect downstream valves and brewing components. For each of these applications the resin component is useful where scale control extends the life of heating elements and membranes.
Ranveth supports OEM/ODM builds from sample to series production. To propose the right rod, we ask for the device or vehicle model, the required size or a drawing (outer diameter, inner diameter, length and end-cap interface), the target airflow or water flow and pressure drop, the operating conditions (feed water quality, chlorine level, temperature), and the expected order quantity. With these details we can select carbon grade and resin ratio, define the end-cap and welding arrangement, and prepare samples for your validation.
Media choices are backed by measurement. Ranveth's own laboratory is CNAS-accredited and issues test reports covering filtration efficiency, dust holding capacity and resistance, so the carbon and resin pairing in a rod can be verified rather than assumed. Production takes place in a 50,000 m² plant that includes six cleanrooms totalling 20,000 m², which is relevant for drinking-water contact parts. The factory holds IATF 16949 (obtained in 2024) together with ISO 9001, ISO 14001 and ISO 45001 systems, and IQC, IPQC and OQC controls run through the process. With more than 20 years of filtration R&D and manufacturing experience and over 1,000 filtration solutions developed, Ranveth supplies OEM and private-label programmes to customers in Europe, the United States, Japan and Korea. Compliance documents for REACH and RoHS are available on request. The company is located in Zhongshan, Guangdong, China.
To discuss a standard Ф38×57 rod or a custom build, send your device or vehicle model, size or drawing, airflow or water flow requirement, operating conditions and quantity through our contact page. We will reply with a suitable configuration, sample arrangement and quotation.
It uses high-iodine coconut shell activated carbon with a food-grade ion-exchange resin integrated into a sintered rod. The carbon adsorbs chlorine, off-tastes and odours, while the resin exchanges hardness ions and helps capture heavy metals such as lead and mercury.
The sintered rod has a uniform microporous structure that balances a high initial flow with fine particle retention. It does not shed black carbon fines, and its large saturation capacity supports a longer interval between replacements.
Yes. The rod can be tooled across outer diameters from Ф30 to Ф60 with flexible length and inner/outer diameter ratios, and end-cap welding can be customised. Send your device model and a drawing so we can confirm the fit.
Please share the device or vehicle model, the required size or drawing, the target water flow and pressure drop, the operating conditions such as feed water quality and chlorine level, and the quantity. We will then propose a configuration and arrange samples for your testing.
Standard models typically start at 1,000–2,000 pieces, depending on size and packaging. For custom models we recommend a minimum of 5,000 pieces.
Standard stock items usually ship within 7–15 days. OEM custom orders generally take 25–35 days for series production after sample approval.
Under standard conditions (inlet chlorine ≤2 ppm, flow 1 L/min), the effective life is about 3,000–6,000 litres or 6–12 months, depending on water quality and usage. Store it in a cool, dry, ventilated place away from sunlight and odours; the unopened shelf life is 2 years.
We can provide 3–5 free samples of standard sizes for your own testing, and CNAS laboratory test reports are available to support your validation and local certification work. To start, send your requirements through our contact page.