This is the question I'm asked most in customers' homes. The short answer: it depends on the type of filter and the water quality in your area. The full answer is a bit more complex, and worth knowing — because a filter that isn't replaced on time doesn't just stop working, it can do harm.
Schedule by filter type
Sediment filter (PP)
The first filter in the chain, the one that catches sand, rust and particles. It's replaced every six months on average. In areas with cloudy water or old pipes — sometimes every four months.
Carbon filters (UDF and CTO)
Responsible for removing chlorine, odours and aftertastes. They are also in the six-month range. When the carbon is saturated it stops adsorbing, and the water goes back to tasting like tap water.
Reverse osmosis membrane
The most expensive component in the system, and therefore the one worth protecting. A typical lifespan is two to three years — but only if the filters before it are replaced on time. A membrane working behind clogged filters wears out much faster.
Remineraliser
Restores minerals to the water after the osmosis process. Usually replaced once a year.
Four signs it's time
Even without counting months, the system gives you signals:
- Reduced flow — the most common sign. The filter clogs and restricts the passage.
- A return of chlorine taste or smell — the carbon is exhausted.
- Cloudy water or particles in the glass — the sediment filter no longer stops them.
- Unusual noise from the system — pressure meeting resistance.
What happens when you don't replace it
A saturated filter doesn't just stop filtering — it becomes a breeding ground for bacteria, and in some cases releases part of what it absorbed back into the water. In addition, the pressure created on the system's other components shortens their life. The cost of a filter set is far lower than the cost of a new membrane or a broken system.
Replace it yourself or call a technician?
Self-replacement is possible, but it's worth knowing what it involves: shutting off the water, opening the filter housings with a special wrench, thoroughly cleaning the housings, greasing the rubber seals so they don't dry out and drip, and reassembling with a pressure test. Most of the leaks I fix in homes come from exactly the seal stage.
You can see the range of filters we install, and the under-sink water systems they fit.
Not sure when yours was last replaced?
Send us a message and we'll check together. If you don't remember when your filters were last replaced — that's a good sign it's time. You can send a photo of the system and we'll tell you exactly which filters you need.
Want to check what suits you?
BEILIN H2O installs and maintains water systems in homes and businesses nationwide. We'd be happy to advise with no obligation and to match exactly what your home needs — Yaniv Beilin, 052-5958465.
