RO Water Purifier Service Schedule
An RO purifier that's overdue for service doesn't always show obvious signs — water can look and taste fine even while filters are past their effective life. Here's a straightforward schedule for what typically needs replacing and when, so you're not guessing.
Sediment Pre-Filter — Every 4–6 Months
This is the first filter water passes through, and it catches visible dirt, rust and sand before it reaches the finer filters. In areas with harder or more turbid municipal water, this can clog faster and may need checking closer to every 3–4 months.
Carbon Pre-Filter — Every 6 Months
Removes chlorine and improves taste/odour before water reaches the RO membrane. A clogged or exhausted carbon filter shortens the life of the membrane behind it, so it's one of the more important filters to stay on top of.
RO Membrane — Every 12–24 Months
The membrane is the core of the system and the most expensive part to replace, but also the longest-lasting when the pre-filters ahead of it are changed on schedule. Skipping pre-filter changes is the most common reason a membrane fails early.
Post-Carbon (Taste) Filter — Every 6–12 Months
The final polish before water reaches the tap. Its job is purely taste and odour, so a tired post-carbon filter usually shows up as water starting to taste slightly different, even if purification itself is unaffected.
UV Lamp (If Fitted) — Every 12 Months
UV lamps lose disinfection effectiveness well before they visibly stop working — the light can still glow while providing little to no actual protection. This one can't be judged by eye, which is why it's on a fixed replacement schedule rather than a wait-until-it-fails one.
Try This First
Quick Checks You Can Do Yourself
Safe to check before booking a technician — if none of these fix it, at least you'll know what to tell us on the call.
A noticeably slower fill rate or a change in taste is often the first sign a filter is due, well before purification is meaningfully affected.
If you're not sure when it was last serviced, that's usually a sign it's overdue — most households service every 6 months as a simple default.
If your purifier has a TDS or filter-change indicator light, don't ignore it even if the water still looks and tastes normal.
FAQ
Common Questions
Does RO water taste different when a filter needs changing?
Sometimes, but not reliably — the post-carbon filter is what mainly affects taste, while the membrane and sediment filters can be overdue without any noticeable taste change. That's why a schedule matters more than waiting for symptoms.
What happens if I skip a filter change for too long?
The main risk is reduced purification quality and faster wear on the more expensive membrane behind it, since a clogged pre-filter forces the membrane to work harder than it should.
Is a slow fill rate always a filter issue?
It's the most common cause, but low water pressure at the source or a partially blocked inlet can also cause it — a technician can quickly tell the difference during a service visit.
How long does a typical RO service take?
Most routine filter-change services are completed within 30–45 minutes at your home.
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