Head-to-Head Comparison
Both systems sit under your sink and give you filtered water through a dedicated tap. That's where the similarity ends. The technology is different, the filtration depth is different, and the problem each one is best at solving is different.
| Feature | Reverse Osmosis — €399 | Carbon Filter — €199 |
|---|---|---|
| Removes chlorine & taste | ✓ Yes | ✓ Yes |
| Removes limescale (calcium/magnesium) | ✓ Yes — 99%+ | ✗ No |
| Removes heavy metals (lead, arsenic) | ✓ Yes | ⚬ Partially |
| Removes fluoride | ✓ Yes | ✗ No |
| Removes bacteria / microorganisms | ✓ Yes | ✗ No |
| TDS reduction | ✓ Yes — dramatically | ✗ No |
| Water tastes like premium bottled water | ✓ Yes | ⚬ Much improved |
| Reduces scale on kettle / coffee machine | ✓ Yes | ✗ No |
| Dedicated pure-water tap included | ✓ Yes | ✓ Yes |
| Suitable for renters | ⚬ Usually (check lease) | ✓ Ideal for renters |
| Annual filter cost | €90/year | ~€60/year |
| Installed price | €399 | €199 |
Reverse Osmosis — The Full Picture
How it works — and why it's different
Reverse osmosis forces water through a semi-permeable membrane with pores so small they stop virtually everything except water molecules. The result is water with almost nothing left in it — no limescale, no chlorine, no fluoride, no heavy metals, no bacteria. The TDS (total dissolved solids) of Tenerife tap water typically drops from 500–600mg/L to under 20mg/L.
- ✓ Removes 99.9% of dissolved contaminants
- ✓ Dramatically reduces limescale in drinking water
- ✓ Pressurised storage tank — water on demand
- ✓ Dedicated tap fitted to your sink
- ✓ Tastes better than most premium bottled water
- ✓ Less scale on kettle, coffee machine, glass
- ✓ Saves €300–€480/year vs buying bottles
- ✓ Annual filter service: €90
With Tenerife water hardness at 500–600mg/L, a carbon filter won't touch the calcium and magnesium that causes scale build-up and the mineral taste. Only reverse osmosis removes dissolved minerals at that level. If your main concern is water quality — not just taste — the RO is the right tool.
Under-Sink Carbon Filter — The Full Picture
Simpler technology, real improvements
Activated carbon works by adsorption — contaminants stick to the surface of the carbon as water passes through. It's very effective at removing chlorine, chloramines, some organic compounds and anything that causes bad taste or odour. It makes Tenerife tap water significantly more pleasant to drink. What it cannot do is remove dissolved minerals, fluoride, or bacteria.
- ✓ Removes chlorine and chloramines
- ✓ Removes bad taste and odour
- ✓ Removes some organic compounds and pesticides
- ✓ Simple, compact installation
- ✓ Dedicated tap fitted to your sink
- ✓ Ideal for rentals — no permanent changes
- ✓ Annual filter cost: ~€60
- ✗ Does not remove limescale or dissolved minerals
The carbon filter is not a budget compromise. It makes a real, immediate difference to how Tenerife water tastes and smells — especially if you're currently drinking straight from the tap or buying supermarket bottles for taste reasons. At €199 installed it's accessible, simple, and effective for what it does.
Which One Is Right for You?
Rather than a generic recommendation, here are the four scenarios we see most often — and what we'd suggest in each case:
Homeowner who wants the best drinking water possible and is fed up buying bottles
The RO system is exactly what you need. It'll pay for itself in under a year if you're currently buying water, and the quality difference is immediate and significant. This is our most popular product for a reason.
Renter in an apartment who just wants the tap water to taste better
The carbon filter at €199 is made for you. Easy installation, no permanent changes, and you'll notice a real improvement in taste and smell immediately. The best starting point.
Family with young children or someone with health sensitivities
When children are drinking tap water daily, the level of filtration matters more. The RO system removes limescale, fluoride, and trace contaminants that a carbon filter won't touch. Worth the extra investment for peace of mind.
Homeowner who also wants appliance protection, softer skin and better laundry
The under-sink systems (RO or carbon) only filter your drinking water tap. For protection across your whole home — washing machine, shower, dishwasher — you want a whole house system alongside your drinking water filter. Many of our customers have both. We can quote a combined installation if that's of interest.
Your Questions Answered
Will a carbon filter stop my kettle from getting limescale?
Is RO water actually better than premium bottled water?
Can I upgrade from a carbon filter to RO later?
Does RO water taste flat or empty?
What about the waste water from RO? Is it a lot?
If you message us on WhatsApp and tell us a little about your home — apartment or villa, renting or owning, main concerns — we'll give you an honest recommendation. No pressure, no upselling. We'd rather you got the right system than the most expensive one.
Still Not Sure Which One?
Message us on WhatsApp with a quick description of your home and what's bothering you about the water. We'll come back with a straight answer — no sales pitch, no pressure.
Tenerife South based. We typically reply within the hour.