Choosing a home water filter in Barcelona
Say goodbye to tap water worries & bad taste.
First: what do you want to fix in Barcelona water?
Barcelona tap water is safe to drink: it meets Spain's Royal Decree 3/2023 and the SINAC bulletins for each supply zone confirm it. What bothers people is something else: the chlorine taste from disinfection, and limescale. Zone D, which supplies 72% of the city, measured 32.9 °f in its latest sample, which is hard water (data by zone).
So start with the right question. If only the taste bothers you, removing chlorine is enough. If you also want less limescale in your drinking water, or fewer metals, PFAS and microplastics, you need a different kind of filter. More in our guide on whether you can drink Barcelona tap water.
Types of home water filter
Carbon filter jug
Chlorine taste and smell. Little effect on limescale, metals or microplastics
No installation. New cartridge every few weeks, and constant refilling
Tap-mounted filter
Chlorine taste and particles
Screws onto the tap. Frequent cartridges and a slow flow
Under-sink carbon
Chlorine, taste and smell, some organic compounds
Simple install. Periodic cartridge changes
Reverse osmosis with remineralisation
Chlorine, limescale, dissolved solids, heavy metals, PFAS, nitrates, microplastics
Under-sink install. Filters every 12 months, membrane every 24
Carbon filters do a lot for taste but barely touch small contaminants such as dissolved metals or PFAS. Reverse osmosis does, and remineralising afterwards stops the water tasting flat.
Buy a purifier, or pay for a service
A purifier you buy is cheaper on day one, but cartridges, membranes and call-outs are on you, and you have to remember to change them on time. A water filter service includes the system, installation, filter changes and maintenance for a fixed fee.
Upfront cost
The system price (Oasly: €629, or €699 installed)
None: €24.90/month or €249/year in Barcelona city
Filter changes
You buy and fit them
Included, and we tell you when they are due
Faults and check-ups
On you; 3-year legal guarantee
Included for as long as you subscribe
If you move
You take it out yourself
We reinstall it free within our area
What to ask a water filter company
Before signing with any water purifier company in Barcelona, get five things in writing: the total price per month or year, what it includes (installation, filters, visits), the minimum term and notice period, a lab test of the system, and who changes the filters and how often.
We publish all of that: €24.90/month with no minimum term, two months' notice, an SGS test of the system and filters included. More in what to ask before you sign.
What we install
A tankless reverse osmosis system under the sink, with its own tap and remineralisation with calcium, magnesium and potassium. In the SGS report NBF25-0016876-01, measured with a new membrane; performance drops as filters age, it reduced lead by 99.8%, PFOS by 99.6% and chlorine by 99.5%. It fills a 330 ml glass in about 10 seconds.
We install in Barcelona city, Badalona, L'Hospitalet, Sant Cugat and Esplugues. Message us on WhatsApp with your postcode and a photo of the cupboard under your sink and we will tell you if it fits.
Live in a rented apartment? No problem.
We seal the hole
Upgrade to a 3-way faucet
No extra hole needed
How does it work
Sign up via WhatsApp
Installation included
Enjoy unlimited water
Yearly filter swap
We move with you
Oasly vs. carbon filter jugs
How much do you really spend on bottled water?
How does the filtration work?
Feedback from people who switched to Oasly
Home water filters: common questions
What is the best home water filter in Barcelona?
It depends on what you want to fix. For chlorine taste, a carbon filter is enough. To also reduce limescale in your drinking water, metals, PFAS or microplastics, the most complete option is reverse osmosis with remineralisation.
Does a water purifier remove limescale?
Carbon filters do not. Reverse osmosis reduces the minerals that form limescale in the water from its own tap. To protect the whole home (boiler, shower, appliances) you need a water softener.
Carbon filter or reverse osmosis?
Carbon improves taste and smell. Reverse osmosis also reduces dissolved solids, heavy metals and PFAS. If you choose RO, look for a system that remineralises the water.
How much does a water purifier cost in Barcelona?
With Oasly, €24.90/month or €249/year in Barcelona city with installation, filters and maintenance included, or €699 to buy the system installed.
Does an under-sink purifier need building work?
Usually not. It needs space under the sink, a socket, the cold-water valve and the drain. The tap goes in a 1.3 cm hole or, if you would rather not drill, on a 3-way tap.
Is it an alternative to bottled water delivery?
Yes: unlimited filtered water at the tap, with no bottles to carry or store.
Is there a minimum term?
No. Cancel any time with two months' written notice.
On desktop? Start on your phone:
