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The Ranveth sintered activated carbon stick Ф51×127 is a coconut-shell carbon block with built-in ion-exchange resin, engineered to reduce chlorine, taste, odour, and heavy metals while softening water in purifiers and appliances. It filters potable water in household RO systems, water dispensers, refrigerators, and commercial coffee machines. It is designed for appliance OEMs, water-treatment brands, and distributors who need a reliable, customisable carbon block. The Ф51×127 format is one of several standard sizes; the same media build is available in diameters from Ф30 to Ф60 mm.
The filter pairs high-iodine coconut-shell activated carbon with food-grade ion-exchange resin in a single sintered structure. The carbon delivers a high adsorption capacity for residual chlorine, off-tastes, and odours, while the resin targets hardness minerals and heavy metals such as lead and mercury. This pairing means one cartridge addresses both aesthetic and health-related water concerns without requiring separate treatment stages.
Sintering fuses the carbon particles into a uniform microporous block. The result is a filter with high initial flow, consistent filtration accuracy, and no black-powder release. The layer build is designed so that water passes through the entire depth of the media, maximising contact time and adsorption efficiency. Because the block is rigid, it maintains its shape and performance throughout its service life, even under varying water pressure.
For buyers, the pairing of media and structure directly influences three key outcomes: efficiency (how well contaminants are removed), airflow resistance (pressure drop across the filter), and service life (how long the filter lasts before saturation). The coconut-shell carbon provides a high surface area for adsorption, while the resin adds softening capacity. The sintered structure ensures that water flows evenly through the media, avoiding channelling and premature breakthrough. This balanced design helps maintain a low pressure drop and a long replacement interval.
| Item | Detail |
|---|---|
| Product name | Carbon block water filter / CTO filter for water purifiers and refrigerators |
| Core filtration media | High-iodine coconut-shell activated carbon + food-grade ion-exchange resin |
| Core performance | Softens water and inhibits scaling, adsorbs residual chlorine (bleach), removes off-colours and odours, and reduces harmful heavy metals such as lead and mercury |
| Accuracy and service life | Uniform microporous structure, high initial flow, high filtration accuracy, no black-powder release; large adsorption saturation capacity, 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- and post-carbon stages), direct-drinking water dispensers, side-by-side refrigerators with built-in water filters, commercial coffee machines |
| Customisation service | Full OEM/ODM support. Length, diameter, and inner/outer diameter ratios can be tooled to match equipment needs; end-cap welding customisation available. |
| Quality certification | 20,000 m² production site certified to ISO 9001 and IATF 16949; filter media meet strict drinking-water safety and hygiene standards; quality control backed by a national-level CNAS testing centre |
The Ф51×127 carbon stick is typically found in household reverse-osmosis (RO) water purifiers, where it serves as a pre-filter (CTO) to protect the RO membrane or as a post-filter (T33) to polish taste. It is also used in direct-drinking water dispensers, side-by-side refrigerators with built-in water filters, and commercial coffee machines. In these applications, the filter’s ability to reduce chlorine and scale helps extend the life of downstream components and maintain consistent water quality.
Because the media combination addresses both chlorine and hardness, it is particularly suited to areas with hard water or where chlorinated municipal supplies are used. The sintered block is compatible with standard housings and can be specified with different end-cap configurations to fit specific appliance designs. OEMs often choose this format for its balance of flow rate and filtration capacity in compact installations.
To specify a custom carbon stick, please provide the following information:
With these details, our engineering team can recommend the appropriate media ratio and sintering parameters, and provide a sample for evaluation.
Ranveth is backed by a manufacturer with a self-built laboratory accredited by CNAS (China National Accreditation Service for Conformity Assessment). This means media choices are test-backed: we can issue reports on filtration efficiency, contaminant capacity, and pressure drop, giving you documented performance data for your own qualification process.
Our production base covers 50,000 m², including six cleanrooms totalling 20,000 m². We hold IATF 16949 (obtained in 2024) and ISO 9001, ISO 14001, and ISO 45001 certifications, and our products comply with REACH and RoHS requirements. With over 20 years of experience in filtration and more than 1,000 custom filtration solutions developed, we support OEM/ODM projects from concept to mass production. Our location in Zhongshan, Guangdong, China, places us at the centre of a mature manufacturing ecosystem.
We welcome the opportunity to discuss your carbon filter requirements. To request samples or a quotation, please contact us with the details listed above. Our team will respond promptly with recommendations, pricing, and lead times. For standard sizes, samples can typically be dispatched within 3–5 days; custom samples may take 10–20 days depending on complexity. We look forward to supporting your project.
The Ranveth Ф51×127 carbon stick combines high-iodine coconut-shell activated carbon with food-grade ion-exchange resin. The carbon adsorbs residual chlorine, tastes, and odours, while the resin softens water and reduces heavy metals such as lead and mercury. Both media are fused into a single sintered block for uniform performance.
The filter is designed for high chlorine removal and efficient adsorption, with a uniform microporous structure that maintains high initial flow and low pressure drop. Specific efficiency and pressure-drop data can be provided upon request, supported by our CNAS-accredited laboratory. Please contact us with your operating conditions for detailed performance curves.
Yes, we offer full OEM/ODM customisation. Outer diameter, inner diameter, length, and end-cap style (including welding) can be tailored to your equipment. Simply provide a drawing or detailed specifications, and we will develop a sample for your approval.
Please <a href="/en/contact">contact us</a> with your device model, required dimensions, flow rate, operating conditions, and estimated quantity. We will respond with a quotation and sample availability. Standard samples are typically provided free of charge (you cover shipping), while custom samples may incur a fee that is refundable upon bulk order.
For standard sizes such as Ф51×127, the MOQ is typically 1,000–2,000 pieces, depending on packaging requirements. Custom sizes generally require an MOQ of 5,000 pieces. We can discuss flexible arrangements for long-term partnerships.
Standard items ship within 7–15 days. Custom OEM orders typically require 25–35 days for mass production, depending on complexity and quantity. We will confirm the schedule at the time of order.
Replacement interval depends on water quality and usage. As a general guide, we recommend replacing the filter every 6–12 months or after treating approximately 6,000 litres of water, whichever comes first. For precise recommendations, please share your water conditions.
No, the sintered structure prevents carbon fines from releasing into the water. The block is rigid and maintains its integrity throughout its service life, ensuring clean and consistent water quality.