The RO membrane does the heavy lifting in your purifier. Over time it fouls or wears and its performance drops. Watch for these signs.
1. Output TDS keeps rising
Compare the TDS of your input water with the purified output. If the gap narrows, the membrane is rejecting less.
2. Very slow flow even with new filters
If fresh pre-filters do not restore flow, the membrane may be clogged.
3. Flat or salty taste
A tired membrane lets salts through and the taste changes.
4. The tank takes much longer to fill
Production rate falls as the membrane fouls.
5. Water discharge changes
Unusual reject flow can point to membrane or restrictor problems.
6. The membrane is simply old
With hard water or skipped filter changes, membranes wear sooner. Regular servicing extends their life.
A technician can confirm with a quick TDS reading and recommend whether cleaning or replacement is the right call.
Quick answers
How long does an RO membrane last?
There is no fixed life — it depends on feed-water quality, pre-filter changes and usage. Regular TDS checks tell you when it is time.