Most of us open the faucet without a moment's thought. But in recent years more and more people stop to ask — what's really in our water, and do we need to do something about it.
The market is full of systems, and sellers speak a language that's hard to decipher. The simplest way to understand it is not by technology but by purpose — what the system is supposed to solve. There are four families, and every system on the market falls into one or more of them.
1 · Particle filtration — when the water doesn't look clean
The basic family. Its purpose is to remove things you can see with the eye: sand, rust, sediment from the plumbing and turbidity.
When it's needed: turbid water after a water outage, rust stains in the sink, recurring clogs in faucet aerators. Common in homes with old plumbing.
What you don't get: a particle filter doesn't improve taste, and doesn't remove chlorine, salts or metals. It cleans what you can see, not what's dissolved.
2 · Taste and odor improvement — the common category
Most home systems are here. The main technology is activated carbon, which absorbs chlorine, odors and organic substances that change the taste.
When it's needed: a chlorine taste in the water, an off-odor, or simply wanting to stop buying bottled water.
What you don't get: activated carbon doesn't remove salts, heavy metals or nitrates. This is the big point of confusion in the market: water that tastes great isn't necessarily clean water.
3 · Removing chemical contaminants — the next level
Here we're talking about things you can't see, smell or taste: lead, copper, nitrates, chloramines and persistent organic compounds such as PFAS.
The main technology here is reverse osmosis. The water passes through a membrane with pores on the order of a thousandth of a micron — too small to let almost anything through except water molecules.
When it's needed: lead plumbing in old buildings, well water, or simply wanting the highest level of purification available for the home.
Worth knowing: osmosis also removes beneficial minerals such as calcium and magnesium. So it's worth choosing a system with a mineralization cartridge in the last stage, which restores them in a controlled dose.
4 · Reducing the microbial load
Systems whose purpose is to reduce bacteria. Common means: an osmosis membrane, a hollow-fiber membrane, antibacterial post-cartridges and UV lamps.
When it's needed: a non-municipal water source, well water, or systems with a storage tank that stands for a long time.
What's important to say honestly: the level of protection against viruses varies greatly between technologies, and not every system rated for bacteria also handles viruses. If this is critical for you — ask to see certificates and laboratory tests, not just a marketing statement.
How to choose without getting confused?
Ask three questions, in this order:
- What's my problem? Taste? Appearance? Concern about contaminants? Each answer leads to a different family.
- What does the system really do? Ask for a list of what it removes, not slogans.
- What's the annual maintenance cost? A cheap system with expensive filters ends up costing more within two years.
And a fourth question almost nobody asks: what happens if a filter isn't replaced on time? An expired filter doesn't just stop working — it can become a source of problems itself.
And what we think
After hundreds of installations and service calls in the field, the most common thing we encounter is people who bought a system from one family and thought they'd bought from another. Someone who wanted to stop buying bottles because of concern about contaminants, and got a carbon system that only improves taste.
We don't sell a system before we understand the problem. Not sure what suits you? Send us a photo of under your sink on WhatsApp — we'll check what fits and get back to you with a recommendation and a price.
