10" Granular Activated Carbon (GAC) Filter – Chlorine, Taste & Odour Removal for RO Systems | Osmotics UK

Refresh your reverse osmosis system's pre-filtration and enjoy noticeably fresher, chlorine-free water with this high-quality 10-inch granular activated carbon (GAC) filter from Osmotics. Filled with a bed of premium activated carbon granules, this cartridge excels at adsorbing chlorine, chloramine, volatile organic compounds (VOCs), pesticides, industrial chemicals, bad tastes, and odours—while also trapping some finer particulates and sediment.

GAC filters offer excellent contact time and surface area exposure for each drop of water (often outperforming solid carbon block in flow rate and longevity for certain applications), making them a popular choice in many domestic RO setups—especially where higher throughput or less pressure drop is desired. The loose granular structure allows water to weave through more carbon pathways, enhancing chemical reduction without the denser packing that can restrict flow in blocks.

Key Benefits

• Superior taste & odour improvement — Eliminates that "pool-like" chlorine/chloramine flavour and chemical aftertaste for crisp, refreshing drinking and cooking water.
• Protects downstream components — Removes chlorine and organics that can damage or shorten the life of your RO membrane (extending it to 2–3+ years).
• Broad contaminant reduction — Targets VOCs, pesticides, herbicides, some pharmaceuticals, and other organics common in UK tap water.
• High flow & efficiency — Granular design supports better flow rates than carbon blocks (less restriction), ideal for standard RO housings.
• Affordable & reliable — Great-value pre-filter; fits seamlessly in most systems.

Specifications

• Size: Standard 2.5" diameter × 10" length (fits most 10" slimline RO housings)
• Filter Type: Granular Activated Carbon (GAC)
• Micron Rating: 20 microns (nominal – good for coarse particulates post-sediment stage)
• Material: High-quality activated carbon granules (typically coconut shell or coal-based)
• Service Life: Typically 6–12 months or 2000–5000 gallons (varies by water quality, chlorine levels, usage volume—replace sooner if tastes/odours return or flow slows)
• Flow Rate: Suitable for 1–3 GPM in domestic RO applications
• SKU: OS-GAC10

Compatibility

Fits most standard 10-inch reverse osmosis housings (Osmotics and third-party brands). Commonly used as stage 2 (after 5–20 micron sediment pre-filter) in 4/5/6-stage RO systems to provide chemical polishing before the membrane. Not for big blue/large-diameter housings.

Recommended Replacement Schedule

• Every 6–12 months (or after noticeable return of chlorine taste/odour).
• In high-chlorine UK municipal water: Aim for 6 months; in lower-contaminant areas: up to 12 months.
• Monitor: Taste test, flow rate, or pair with a full RO maintenance schedule.

This reliable GAC filter is a smart, economical choice for keeping your RO system performing at its best—perfect for home drinking water, aquariums (pre-treatment for stable parameters), window cleaning (spot-free results), or car rinsing. In stock with fast UK delivery (next-day options available). Pair it with our 5 Micron Sediment Pre-Filter, Carbon Block alternative, or full replacement kits for complete maintenance.