Compatibility | What it reduces | Specs | How often to change | How to replace | FAQs | Reviews

Compatibility

This 2.5'' x 10'' carbon block water filter replacement cartridge fits standard 10'' housings and our Pearl-T water filter. It reduces chlorine, bad tastes, and nasty odours from mains water, delivering cleaner drinking water for kitchens, under sink systems and drinking water filters.

Compatible with standard 2.5 x 10'' housings, most undersink drinking water systems (unless you have one that only fits a bespoke size cartridge), caravan water filtration, office drinking water systems, coffee machines, ice makers, single and twin housing systems, and reverse osmosis pre-filtration stages.

Unsure if this is the correct replacement cartridge? Contact us and we'll help.

What it reduces and what it doesn't

A top-of-the-range coconut shell carbon block cartridge that reduces chlorine, taste, odour and sediment for cleaner, better-tasting water. Independent laboratory testing verifies >90% chlorine removal. If you're on mains water there will be chlorine or chloramine present.

This carbon block cartridge does not treat limescale or reduce fluoride.

Let's compare carbon block cartridges with sediment filters and 1 micron filters. Sediment filters remove dirt, rust and particles. Carbon block filters additionally reduce chlorine, taste and odours. A 5 micron filter provides good flow rates while reducing sediment and chlorine. A 1 micron filter captures finer particles but may reduce flow.

Specifications

On rare occasions a different brand may be supplied if we have supply issues with Watts. It does the same job as the Watts F109009; just a different brand.

How often to change and signs it needs changing

We recommend changing your cartridge every 12 months, or after 37,854 litres / 10,000 US gallons, whichever comes first. Signs it's due include reduced water flow and a returning taste or smell of chlorine.

How to replace

To change your cartridge, follow these steps:

1. Turn off the water supply and open the filter tap to release pressure.
2. Unscrew the housing bowl from the cap and remove the old cartridge.
3. Insert the new cartridge, then reseat the O-ring and screw the bowl back onto the cap, hand-tight.
4. Turn the water supply back on and check for leaks.
5. Flush the new cartridge for 1–2 minutes to remove any carbon fines before use.

Your old cartridge can go into your household recycling.

FAQs

How often should I change this cartridge?

We recommend every 12 months, or after 37,854 litres / 10,000 US gallons, whichever comes first. You may also notice the taste or smell of chlorine returning when it's due.

Does this cartridge remove chlorine?

Yes. Independent laboratory testing verifies more than 90% chlorine removal. If you're on mains water there will be chlorine or chloramine present, and this coconut shell carbon block reduces chlorine along with taste, odour and sediment.

Why do I need to change the O-ring?

Over prolonged time under compression the O-ring's profile can flatten; the cross section should be round, and if it isn't it may not seal easily. Even without an obvious leak we recommend replacing the O-rings every two or three years as a precaution. As O-rings age and compress, the bowl has to be tightened more, which makes it harder to loosen next time you change the cartridge.

Can I recycle my old cartridge?

Yes, your old water filter cartridge can be placed into your household recycling.