Sintered Activated Carbon Stick Filter Ф37.5×75 for Water Purifiers

Jyntrel's sintered activated carbon stick filter Ф37.5×75 is a coconut-shell carbon block with built-in ion-exchange resin, designed to reduce chlorine, odours, colour and heavy metals in drinking water. It is used in household reverse-osmosis purifiers (as a pre-filter CTO or post-filter T33), direct-drinking dispensers, refrigerator water filters and commercial coffee machines. The cartridge is aimed at appliance makers, water-treatment brands and OEM/ODM buyers who need a stable, customisable carbon block for their own systems.

Operating Conditions and Airflow Path

This filter belongs to the water path rather than the air path: it sits in the cold-water line of a purifier, dispenser or refrigerator, and everything about its behaviour is set by the flow and pressure in that line. At a rated flow of about 0.5–1.0 L/min, water passes radially through the sintered carbon wall; the pressure drop across the block stays low while the flow remains even, because the micro-pore structure is uniform through the wall.

For system designers, the practical questions are the same as on the air side: what is the incoming water quality, what flow must be delivered at the tap, and how much pressure budget is available? The Ф37.5×75 format suits compact housings where a short cartridge is preferred. The resin component works alongside the carbon: the carbon adsorbs residual chlorine and organic matter, while the resin exchanges hardness ions and helps hold back metals such as lead and mercury. Because the block is sintered as one piece, it does not shed loose carbon fines into the downstream line — a point that matters when the cartridge sits ahead of a membrane or a polished post-filter.

Core Performance

The carbon is a high-iodine-value coconut-shell grade, chosen for fast kinetics and a large adsorption capacity; the block therefore keeps a high chlorine-removal rate over its working life rather than fading quickly. Adsorption of residual chlorine (bleaching powder), off-flavours and odours, and colour is the primary duty, and the ion-exchange resin adds softening action that limits scale and supports heavy-metal reduction.

Filtration accuracy is in the 5–10 µm range, so the block also retains rust, sediment and other particulate matter carried in the feed water. The uniform pore structure gives a high initial flow with a high dirt-holding capacity, and the sintered body does not release black powder downstream. Service life is typically 3–6 months depending on feed-water quality and daily volume, and the cartridge should be replaced when chlorine breakthrough or a fall in flow is observed.

Selection and Customisation: the Data We Need

Jyntrel supports full OEM/ODM work on this family: length, diameter and the inner/outer diameter ratio can be set to the housing, and end-cap welding can be specified. Formulation is also flexible — iodine value, carbon-to-resin ratio, carbon type and the addition of KDF or silver-based bacteriostatic components can be discussed against your application. To quote accurately we ask for:

• Device or appliance model and the housing drawing, or the required outer diameter, length and bore;
• Required flow rate (L/min) and inlet pressure;
• Feed-water quality: chlorine level, hardness, turbidity, temperature;
• Target life and annual quantity;
• End-cap, seal and packaging requirements, plus logo and retail packaging if needed.

Parameters

Typical Applications

In a household RO system the cartridge is commonly used as the CTO stage ahead of the membrane, protecting it from chlorine and particulate load, or as a T33 polishing stage after the membrane to improve taste. In direct-drinking dispensers it provides the main chlorine and odour barrier in a compact envelope. Side-by-side refrigerators use it in the internal water line, where the short Ф37.5×75 body fits the available space. Commercial coffee machines use it to remove chlorine and hardness that would otherwise affect extraction and scale build-up in the boiler. Because sizes can be made to order, the same construction can be adapted to other small water appliances.

Manufacturing and Testing at Jyntrel

Jyntrel has more than 20 years of filter development and manufacturing experience and has been exporting to Europe, the United States, Japan and South Korea for over 20 years, which gives buyers a stable supply base. Multiple automated production lines support a monthly capacity of several million pieces, and more than 1,000 filter solutions have been developed to date.

The 50,000 m² plant in Zhongshan, Guangdong, includes six clean workshops totalling 20,000 m², where carbon blocks are produced in a controlled environment. The in-house laboratory is CNAS-accredited and can issue test reports on filtration efficiency, dust-holding capacity and resistance. The company holds ISO 9001, ISO 14001 and ISO 45001 certification and has been certified to IATF 16949 since 2024; products comply with REACH and RoHS and supporting documents can be supplied. Quality control runs through IQC, IPQC and OQC at every stage.

Share Your Operating Conditions

To move from specification to a quote, send us your device or vehicle model and the housing size or drawing, the required flow rate, your feed-water conditions, the annual quantity and any packaging or branding needs. Our team will confirm the carbon grade, resin ratio and end-cap arrangement that fit your system. Contact Jyntrel to start the discussion.