Sintered Activated Carbon Stick Filter Ф37.5*75

This sintered activated carbon stick filter, model Ф37.5*75, is a cylindrical carbon block that combines high-iodine coconut shell carbon with food-grade ion exchange resin to reduce chlorine, taste, odour, colour, and heavy metals such as lead and mercury in drinking water. It is designed for point-of-use water treatment in household reverse osmosis systems (as a pre-filter CTO or post-filter T33), water dispensers, side-by-side refrigerators, and commercial coffee machines. The brand is Ranveth, and the filter is manufactured by a company with over 20 years of filtration experience in Zhongshan, Guangdong, China.

Media Pairing and Layer Build

The performance of this carbon stick comes from how its two media are paired and formed into a single porous structure. High-iodine coconut shell activated carbon provides a large internal surface area for adsorbing residual chlorine, volatile organic compounds, and off-flavours. Food-grade ion exchange resin is distributed within the carbon matrix to soften water by exchanging hardness ions and to assist in capturing dissolved heavy metals. The mixture is sintered – a process that bonds the particles without adding binders that could leach or block pores – resulting in a uniform microporous structure. This structure gives the filter a high initial flow rate, a filtration accuracy in the 5–10 micrometre range, and the ability to retain particulate matter such as rust and sediment. Because the carbon is fully sintered, the filter does not release black carbon fines into the water. The combination of adsorption and ion exchange in one stick means a single cartridge addresses both chlorine-related taste issues and scale formation, while the large adsorption capacity supports a service life of typically 3–6 months, depending on water quality and usage. For buyers, the key point is that media selection and layer build are not arbitrary; they are chosen to balance efficiency, pressure drop, and longevity for the intended application.

Specification Sheet

Where It Is Used

The Ф37.5*75 size is commonly specified for compact water treatment devices where space is limited but performance cannot be compromised. Typical installations include under-sink reverse osmosis systems, where the filter serves as a pre-filter to protect the RO membrane from chlorine damage or as a post-filter to polish the final drinking water. It is also used in point-of-use water dispensers, in refrigerators with built-in water filtration, and in commercial coffee machines where consistent water quality is essential for taste and machine longevity. Because the filter combines carbon adsorption and ion exchange, it is particularly suited to areas with hard water or noticeable chlorine levels. The standard size range from Ф30 to Ф60 (with lengths from 57 mm to 240 mm) allows engineers to select a cartridge that fits existing housings without redesigning the system.

What to Send Us for a Custom Build

To develop a custom carbon stick that matches your device or vehicle (for mobile water treatment applications), please provide the following information:

• Device or vehicle model (if applicable) – to help us understand the installation envelope.
• Dimensions or a drawing – outer diameter, length, inner diameter, and any end-cap requirements. The standard Ф37.5×75 mm is a reference; we can mould to any ratio.
• Airflow or water flow rate – the required flow rate at a specified pressure drop, so we can balance media and structure.
• Operating conditions – water quality parameters (e.g., chlorine level, hardness, temperature) and expected daily volume.
• Quantity – estimated annual demand or order quantity, to advise on tooling and pricing.

With these details, our engineers can propose a media formulation (e.g., iodine value, resin ratio) and a layer build that meets your efficiency and lifetime targets. Send your requirements via the contact page.

Why Source from Ranveth

Ranveth is backed by a manufacturer with resources that support consistent quality and custom development. First, the company operates a CNAS-accredited laboratory (China National Accreditation Service for Conformity Assessment), which can issue test reports on filtration efficiency, dust holding capacity, and resistance. This means media choices are test-backed rather than assumed. Second, production takes place in a 50,000 m² plant, including six cleanrooms totalling 20,000 m², where carbon sticks are made in a controlled environment to prevent contamination. Third, the quality management system is certified to IATF 16949 (achieved in 2024) and ISO 9001, ISO 14001, and ISO 45001, reflecting a structured approach to quality, environment, and safety. Fourth, products comply with REACH and RoHS regulations, and compliance documents can be provided. Fifth, with over 20 years of filtration experience and exports to Europe, the US, Japan, and South Korea, the company understands the documentation and consistency required by international buyers. Finally, the company supports OEM/ODM customisation of size, structure, media grade, end caps, logo, and packaging, and has developed more than 1,000 filtration solutions. All of this is delivered from Zhongshan, Guangdong, China.

Request Samples and a Quote

We welcome the opportunity to discuss your water filtration requirements. For standard Ф37.5*75 carbon sticks, samples are typically available free of charge; you only cover the international courier cost, and ready stock ships in about 3–5 working days. Custom formulations or sizes usually require 7–15 working days for sampling, and we will confirm a detailed specification sheet before proceeding. To receive a quotation, please tell us your required dimensions, flow rate, operating conditions, and estimated order quantity. Visit our contact page to send your inquiry; our team will respond with technical recommendations and pricing.