Wrekin Water offer a good selection of 10in Large Diameter Housing filters manufactured specifically for improving the quality of Drinking Water.  We have options of Carbon Block, Granular Carbon and media cartridges for all requirements 4.5"x10" (Nominal)

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Frequently asked questions

Large diameter (often called Big Blue) cartridges are wider than standard 2.5in filters, giving more media surface area and longer service life before replacement — suited to higher-flow or whole-house drinking water applications.

Carbon block/granular cartridges (CB10BB, GC10BB) target chlorine, taste and odour; resin cartridges (RF10BB) target scale and hardness; combined resin-and-carbon (RGC10BB) cartridges do both jobs in one cartridge.

Large diameter housings are physically bigger than standard ones, so check you have the clearance before switching — they're more commonly used in utility rooms or larger under-sink spaces than tight cabinets.

Thanks to the extra media volume, these typically last longer than standard-diameter cartridges — often 6–12 months depending on usage, but check the specific product listing for its rated life.

No — large diameter (Big Blue) cartridges need a matching large diameter housing; they won't fit a standard 2.5in housing.