Kent RO Filter Replacement: How Often, Which Filters, and Why TDS Decides

Every Kent owner eventually asks the same two questions: how often do the filters really need changing, and is the person servicing it using genuine parts? As Kent's authorized service, maintenance and repair center for the Pokhara region, here is the honest version.

What each stage does — and how long it lasts

• Sediment (PP) filter: catches sand, silt and rust. Typically 3–6 months, sooner with turbid supply water.
• Carbon filters (GAC/CTO): remove chlorine, odour and taste, and protect the membrane. Typically 6–12 months.
• RO membrane: the heart of the purifier, removing dissolved solids down to 0.0001 microns. Typically 18–36 months — hugely dependent on your input water's TDS.
• UV lamp: loses sterilizing strength long before it stops glowing. Replace yearly.
• Post-carbon / mineralizer (T33): polishes taste. Yearly is typical.

Why the calendar is the wrong tool

Two houses in Pokhara can have wildly different water. A membrane fed 150 TDS well water lasts years; the same membrane on 600 TDS supply clogs in a fraction of that time. That is why our Kent Service & Maintenance plan replaces filters based on measured readings: we test your water's TDS at the purifier on every visit, every 2–3 months, and give you the numbers in writing. You replace what the readings say — nothing more, nothing sooner.

The warning signs between services

• Output has slowed to a trickle — sediment or membrane is loading up
• Water tastes different than it used to — carbon stage is exhausted
• The purifier runs much longer to fill the tank — pressure or membrane issue
• TDS at the tap has crept up — membrane nearing the end

Genuine parts, genuine service

A purifier is only as trustworthy as its cartridges. As the authorized Kent center for this region we fit genuine parts, and as a wholesale dealer of filter spares our prices are lower than typical retail. If your last service came with no TDS reading and no part packaging, ask questions.