Inline water filters
A sealed cartridge fitted directly into a water line, most often feeding a fridge, an ice maker, a coffee machine or a drinks dispenser.
An inline filter is the simplest thing on this site: a sealed cylinder with a push-fit connector at each end that goes into an existing water line. There is no housing to open and no cartridge to extract — when it is spent you replace the whole unit.
They are the standard way to filter the supply to an American-style fridge freezer, a plumbed-in ice maker or a bean-to-cup coffee machine. Most are carbon-based, aimed at chlorine and taste, and some add scale protection for machines that heat water.
The appeal is that fitting one is genuinely a five-minute job on push-fit pipe, and the replacement is the same job again. The limitation is that a sealed unit is more expensive per litre than a refillable housing, and you are throwing the whole thing away each time.
Best for
- American-style fridge freezers with a water dispenser
- Plumbed-in ice makers
- Bean-to-cup and commercial coffee machines
- Water coolers and drinks dispensers
- Anywhere a filter is needed with minimal disruption
Ubiquitous behind bars and in coffee shops, where scale protection for the machine is usually the real objective.
Pros and cons
Pros
- Genuinely quick to fit and to replace
- No housing to buy, no cartridge to fiddle with
- Compact enough to sit behind an appliance
- Sealed, so nothing to sanitise
Cons
- Whole unit is thrown away each time
- More expensive per litre than a refillable housing
- Lower capacity than an under-sink system
- Connector sizes vary — 1/4 inch is common but not universal
Can you install it yourself?
Yes, this is a realistic DIY job
Skill level: Easy · Time: about 20 minutes
Turn off the supply, pull the pipe out of the old filter's collet, push it into the new one, turn the water back on and run a few litres through. It is the most approachable job on this site.
Tools you will need
- Nothing, on push-fit. A towel and a bowl for the small amount of water in the line.
Call a plumber if
- There is no existing water line and one needs running to the appliance
Maintenance
Replace every six months, or as the manufacturer specifies. Coffee machines in hard water areas often need it more often.
Replacement interval: roughly every 6 months, though volume matters more than time. More on cartridge intervals.
What installation costs
£60–£140 indicative UK labour
Labour only, and most people do this themselves. Higher if a new water line has to be run to the appliance.
