Oasly Home tankless under-sink reverse osmosis unit with remineralization filter

Oasly Home

Limitless Hydration

Pure, mineralized water. Straight from your tap.

Tankless, on demand
Alkaline remineralization
Free installation in Barcelona

€24.90/month in Barcelona city · €27.90/month in Esplugues, Badalona, L'Hospitalet and Sant Cugat. No minimum term — cancel at any time with two months' written notice.

Key specifications

Capacity
600 GPD
up to 2,270 litres a day
Output speed
10 seconds
to fill a 330 ml glass
Filtration
7 stages
across 3 cartridges
Drain ratio
2:1
roughly 6× less water to drain than a 1:3 system
TDS reduction
94–95%
total dissolved solids
Service
Free installation
and service in Barcelona

Reduction rates were measured at startup with a new membrane; real-world performance declines as filters age.

Oasly Home speed and water efficiency: fills a 330 ml glass in about 10 seconds, 600 GPD rated membrane, up to 2,270 litres a day, 2:1 filtered-to-drain ratio, no storage tank.
Filtered water pouring from a kitchen tap into a glass

Direct flow. No tank.

10 seconds

to fill a 330 ml glass

  • 2,270 litres a day

    600 GPD rated membrane

  • 2:1 filtered to drain

    roughly 6× less waste than a 1:3 system

Filtration

Oasly seven-stage filtration: composite pre-filter, reverse osmosis membrane at 0.0001 micron, and alkaline remineralization filter.

Three cartridges. Seven stages.

Illustration of layered water filtration media

Illustrative. Filter media are housed inside sealed cartridges.

Tap water in ↓

Composite pre-filter

Sediment and carbon

Stages 1–3 · every 12 months

  1. 1Pleated sediment layerRust, sand and silt down to 5 µm
  2. 2Activated carbon blockChlorine, chloramine, taste and odour
  3. 3Carbon compound layerVOCs, trihalomethanes and organic residues

Reverse osmosis membrane

600 GPD

Stage 4 · every 24 months

  1. 4Reverse osmosis membraneDissolved solids, microplastics, PFAS, lead, arsenic and nitrates

Remineralization filter

Alkaline and minerals

Stages 5–7 · every 12 months

  1. 5Alkaline mediaLeaves the water slightly alkaline
  2. 6Mineral restorationAdds calcium, magnesium and potassium
  3. 7Post-carbon polishFinal taste polish before the tap

Pure, mineralized water out ↓

Stage counts describe the filtration layers inside each cartridge. Replacement intervals assume typical Barcelona mains water and normal household use.

Particle size comparison showing the Oasly membrane pore size of 0.0001 micron next to human hair, cysts, microplastics and dissolved salts.
Macro photograph of a water droplet

Almost nothing gets through

  • Human hair70 µm
  • Cysts — Giardia, Cryptosporidium3–15 µm
  • Microplastics0.5–5 µm
  • Dissolved salts, lead, PFAS0.001 µm
Everything above is filtered by size

Oasly membrane — 0.0001 µm

94–95%

reduction in total dissolved solids

0.0001 µm

membrane pore size

7

filtration stages across three cartridges

Particle sizes are typical published ranges. Reduction rates from SGS test report NBF25-0016876-01 (NSF/ANSI 58-2023). Rates were measured at startup with a new membrane; real-world performance declines as filters age.

What we remove

Heavy metals
  • Lead(99.8%)
  • Arsenic(99.9%)
  • Chromium VI(99.6%)
  • Cadmium(99.6%)
  • Copper(99.3%)
  • Mercury(97.1%)
  • Barium(99.7%)
  • Selenium(97.1%)
Chemicals
  • PFAS — PFOS 99.6%, PFOA 99.4%
  • Chlorine(99.5%)
  • Chloramine
  • Perchlorate(98.1%)
  • VOCs
  • Pesticides & herbicides
Microorganisms
  • Cysts — Giardia, Cryptosporidium
Particles
  • Microplastics
  • Turbidity(97.7%)
  • Sediment & rust
Other
  • Total dissolved solids(94–95%)
  • Nitrates(96.8%)
  • Fluoride(94.7%)

SGS report NBF25-0016876-01: chlorine was tested to NSF/ANSI 42-2023; all other figured reductions were tested to NSF/ANSI 58-2023. Rates were measured at startup with a new membrane; real-world performance declines as filters age.

Before and after comparison: flat, mineral-free water straight off the reverse osmosis membrane becomes slightly alkaline remineralized water with calcium, magnesium and potassium restored.

Alkaline adjustment

Before

Straight off the membrane

Purified water with almost no minerals left in it. It tastes flat.

After remineralization

Slightly alkaline, minerals back in

Calcium, magnesium and potassium are released back into the water, so it tastes like water again instead of tasting flat.

Ca²⁺

Calcium

Mg²⁺

Magnesium

K⁺

Potassium

Ionically activated minerals released by the remineralization cartridge, replaced once a year.

If you test it yourself

A TDS pen reads higher after remineralization than straight off the membrane, because the filter puts calcium, magnesium and potassium back in.

That higher number is the minerals, not contaminants. It is what you want to see.

Taste and readings vary with incoming mains water and how recently the remineralization cartridge was replaced.

Why Choose Oasly

Health

Pure water free from toxins, remineralized with essential minerals: calcium, magnesium and potassium.

Taste

Removes chlorine taste, and puts minerals back so the water does not taste flat. Water the way nature intended.

Convenience

Unlimited water on demand, fills a glass in just 10 seconds. No more carrying heavy bottles.

Eco-Friendly

No plastic bottles, and a 2:1 filtered-to-drain ratio — roughly 6× less water sent to the drain than a conventional 1:3 system.

Cost-Effective

Saves hundreds on bottled water yearly. Just €0.68-0.83 per day for unlimited pure water.

Looked after

We handle installation, filter changes and servicing. You just drink the water.

Comparison table: Oasly Home tankless reverse osmosis versus a conventional tank RO system.

Oasly Home vs. tank system

Oasly HomeConventional tank RO

Under-sink footprint

Slim unit, no tank
Unit plus an 8–12 L pressure tank

Water sent to drain

2 parts filtered : 1 part drain
Around 1 part filtered : 3 drain

Water storage

None — filtered on demand
Sits in a bladder tank between uses

Plumbing

Integrated waterway, fewer joints
Multiple external lines and fittings

Filter removal

Twist out by hand, no tools
Housing wrench, often a plumber

Filter changes

We schedule and remind you
You track it yourself

Comparison figures for conventional systems are typical market values and vary by model.

We keep track of it for you

Filter changes, scheduled

We track the life of every filter and get in touch when one is due. You don't need to remember, monitor anything, or work out which cartridge it is.

Upgrades included

If we improve the system, subscribers get the upgrade at no extra cost.

A real person, on WhatsApp

Something not right? Message us and a technician answers — no ticket queue, no call centre.

Will it fit under your sink?

Installation requirements for the Oasly Home: cabinet space, 230 V socket, cold water feed, drain connection and a place for the tap.
Cabinet space

At least 45 × 45 × 45 cm clear. The Oasly Home measures 400 mm high, 380 mm deep, 140 mm wide, plus the remineralization filter beside it.

230 V socket

An earthed outlet under or near the sink. The system draws about 85 W only while it is producing water.

Cold water feed

A standard kitchen shut-off valve on the cold supply. Mains pressure 1.4–5.5 bar, water temperature 4–38 °C. No extra plumbing work is needed in almost every Barcelona kitchen.

Drain connection

A saddle clamp fits onto the existing sink waste pipe. Nothing is cut or replaced.

A place for the tap

The standard Oasly faucet needs a 1.3 cm hole in the worktop. The 3-way faucet replaces your existing mixer tap.

Not sure it fits?

Send a photo of your under-sink cabinet on WhatsApp. We confirm before you book.

Message us on WhatsApp →

Faucet options

Standard Oasly faucet in brushed steel, dispensing filtered water

Standard Oasly faucet

Included free

Requires drilling a ~1.3 cm hole in the countertop

Three-way faucet in chrome, delivering filtered and regular water from one tap

3-way faucet upgrade

€79.90 add-on

Replaces your existing tap, delivering both filtered and regular water

Yours to keep

Choose Your Plan

Monthly Subscription

€24.90/month

€0.83/day in Barcelona city

€24.90/month in Barcelona city (08001–08042) · €27.90/month in Esplugues, Badalona, L'Hospitalet and Sant Cugat.

No minimum term. Cancel at any time with two months' written notice.

  • Installation: Included
  • Filter Changes: Included
  • Maintenance: Included
  • Relocation in service area: Included
  • Deposit: None
  • Upfront cost: None
Get Started
Best Value

Yearly Subscription

€249/year

€0.68/day in Barcelona city

€249/year in Barcelona city (08001–08042) · €279/year in Esplugues, Badalona, L'Hospitalet and Sant Cugat.

No minimum term. Cancel at any time with two months' written notice.

  • Installation: Included
  • Filter Changes: Included
  • Maintenance: Included
  • Relocation in service area: Included
  • Deposit: None
  • Upfront cost: None
Get Started

One-Time Purchase

€629 machine only

or €699 with installation in Barcelona

  • Installation: €699 with installation in Barcelona
  • Filter Changes: Customer purchases
  • Maintenance: Customer responsibility
  • Relocation in BCN: Not included
  • Deposit: None
  • Ownership: Customer owns
Get Started

Subscriptions cover Barcelona city (postal codes 08001–08042) at €24.90/month or €249/year, and the extended area of Esplugues, Badalona, L'Hospitalet de Llobregat and Sant Cugat del Vallès at €27.90/month or €279/year. Both include the system, installation, yearly filter changes, all maintenance and service calls, and free relocation if you move within the service area. No deposit and no upfront cost on any plan. No minimum term — cancel at any time with two months' written notice.

Warranty & Service

On subscription: service included

Installation, every filter change, servicing, leak checks and relocation within Barcelona are all included for as long as you subscribe. No call-out fees, no parts to buy.

On purchase: 3-year EU statutory warranty

Buy the system outright and it carries the standard Spanish and EU conformity guarantee — three years from delivery, covering manufacturing defects and system performance.

The detail, if you want it

Cost comparison · 5-year overview

Monthly, yearly or buy outright — what each option really costs you after 1, 2, 3, 4 and 5 years.

View →

Frequently Asked Questions

Product & Technology

Contaminants & Water Quality

Installation & Requirements

Subscription & Pricing

Maintenance & Support

Service Area & Logistics

Health & Safety

Environmental Impact

Comparisons

Technical Troubleshooting

About Oasly

  • Main website: https://www.oasly.es
  • Online shop: https://oasly.shop
  • Product details: https://product.oasly.es
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