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This sintered activated carbon stick filter, sized Ф37.5×75 mm, is a coconut-shell-based carbon block with built-in ion-exchange resin, made by Thesvin for point-of-use water treatment. It reduces chlorine, taste and odour, and helps soften water while trapping fine sediment. It is designed for domestic RO purifiers (as a CTO or T33 stage), water dispensers, refrigerator water filters, and commercial coffee machines. Thesvin manufactures it in Zhongshan, Guangdong, with flexible sizing from Ф30 to Ф60 mm to match your housing.
Fitment is the first thing to check. This carbon stick is a push-in or end-cap mounted cartridge: the outer diameter and length must match the housing bore and the end-cap geometry so the cartridge seats without bypass. Thesvin moulds each stick to your drawing, so the OD, ID and length can be adjusted independently, and end caps can be welded on request. The sintered body is rigid and self-supporting, which keeps the stick concentric inside the housing and reduces the risk of channeling around the seal. For refrigerator and dispenser units, the stick often fits a bayonet or twist-lock holder: send the holder drawing and Thesvin will match the end profile. Because the stick is not a drop-in replacement for every brand, always confirm the interface before ordering.
The filtration medium is high-iodine coconut shell activated carbon, sintered into a porous block. The open pore structure gives a high initial flow and a filtration rating typically in the 5–10 micrometre range, which captures rust, sand and other particulate matter. The carbon adsorbs residual chlorine (from bleaching powder), off-flavours, off-odours, VOCs and organic matter; the FAQ states a chlorine reduction of ≥95%. The embedded food-grade ion-exchange resin softens the water and helps reduce heavy metals such as lead and mercury. The block is formulated not to release black carbon fines, so downstream membranes and taps stay clean. Flow is about 0.5–1.0 L/min, and service life is typically 3–6 months depending on water quality and usage.
| Item | Detail |
|---|---|
| Product name | Carbon block water filter / CTO filter for water purifiers and refrigerators |
| Core filtration material | High-iodine coconut shell activated carbon + food-grade ion-exchange resin |
| Core performance | Softens water and inhibits scaling; adsorbs residual chlorine (bleaching powder); removes colour and odour; reduces harmful heavy metals such as lead and mercury |
| Precision and life | Uniform micro-pore structure, high initial flow, high filtration accuracy, no black carbon fines; large adsorption capacity for long service life |
| Standard size references (OD × length, mm) | Ф60×130 / Ф62×240 / Ф37.5×75 / Ф38×57 / Ф40×195 / Ф51×127 / Ф32×126 / Ф32×106 |
| Main applications | Domestic RO purifiers (pre- or post-CTO/T33), direct drinking water dispensers, side-by-side refrigerator water filters, commercial coffee machines |
| Customisation | OEM/ODM supported. Length, diameter and ID/OD ratio can be tooled to your device; end-cap welding available. |
| Quality system | ISO 9001 and IATF 16949 certified production; filter media meet potable water hygiene standards; CNAS-accredited laboratory for quality control. |
Thesvin runs a 50,000 m² production site in Zhongshan, Guangdong, with 20,000 m² of clean workshop space across six clean rooms. The quality system is certified to ISO 9001, ISO 14001 and ISO 45001, and the company has held IATF 16949 since 2024. Incoming, in-process and outgoing inspections (IQC, IPQC, OQC) check dimensional consistency and batch quality, and the CNAS-accredited laboratory can issue test reports for filtration performance, dust holding and pressure drop. Standard sizes typically ship in 15–25 days; custom sizes may take longer. Thesvin has exported to Europe, the US, Japan and Korea for more than 20 years and supports OEM/ODM for size, structure, media grade, logo and packaging.
To get an accurate quote, send the device or vehicle model, a drawing or the old part dimensions, the required flow rate (L/min), operating conditions (water quality, pressure, temperature), and the quantity you need. Thesvin will confirm fitment and provide a quotation. Contact us to start.
Fitment depends on matching the outer diameter, length and end-cap profile to your housing. Thesvin supports sizes from Ф30 to Ф60 mm and can weld end caps to suit your holder. Send a drawing or the old part and Thesvin will confirm whether the standard Ф37.5×75 mm size fits or a custom size is needed.
Yes. An old part or a clear photo with dimensions is often the fastest way to confirm the interface. Thesvin will measure it and match the OD, ID, length and end profile. If no old part is available, a drawing or the device model number is sufficient to start.
The FAQ states a chlorine reduction of ≥95%, with a typical filtration accuracy of 5–10 micrometres. The carbon block also reduces taste, odour, VOCs and organic matter, while the ion-exchange resin helps soften water and reduce heavy metals such as lead and mercury. Flow is about 0.5–1.0 L/min.
Yes. Thesvin supports OEM/ODM for length, diameter, ID/OD ratio, end-cap welding, carbon grade, resin content and packaging. With over 1,000 filtration solutions developed, Thesvin can adjust iodine value and CTO formulation to your water conditions. Custom sizes are tooled to your device requirements.
For the standard Ф37.5×75 mm size, samples are typically free with the buyer covering freight, and stock samples ship in about 3–5 working days. Custom samples take 7–15 working days after the specification is confirmed. Send your device model, drawing or old part, required flow and quantity to receive a quote.
The MOQ for the standard Ф37.5×75 mm carbon stick is typically 5,000–10,000 pieces, depending on packaging. Custom products are quoted separately. Standard batch lead time is 15–25 days, and the 50,000 m² facility supports annual volumes in the millions of pieces.
Service life is typically 3–6 months, depending on water quality and daily volume. Replace the cartridge when flow drops noticeably or when chlorine breakthrough is detected. The high adsorption capacity gives a long life, but regular replacement protects downstream membranes and ensures consistent water quality.
The production site is certified to ISO 9001, ISO 14001 and ISO 45001, and has held IATF 16949 since 2024. The CNAS-accredited laboratory provides quality control, and filter media meet potable water hygiene standards. For market-specific compliance files, please state your destination when inquiring.