How Often Should You Really Change Your RO Filters?

Most purifier companies give a single "replace every 12 months" recommendation — but that's a gross oversimplification. Different filters have different lifespans, and your actual usage matters a lot.

Sediment Pre-Filter (PP Candle)

This is the first-stage filter that traps visible particles like sand, silt, and rust. If your water is very dirty or you're in an older building with iron pipes, this filter can clog in as little as 3–4 months. In cleaner areas, it lasts up to 6 months.

Activated Carbon Filter (Pre-Carbon)

This removes chlorine, chloramines, and bad taste/odour. A family of 4 using the purifier for cooking and drinking should replace this every 6 months. If your municipal supply is heavily chlorinated, change it sooner.

RO Membrane

The membrane is the most expensive component (₹800–₹2000). With average use and good incoming water quality, it lasts 2–3 years. However, if the pre-filters are not changed on time, sediment and chlorine can permanently damage the membrane, reducing its life to just 6–8 months.

Post Carbon Filter

This final polishing filter improves taste. Change it once a year.

UV Lamp

Even if the lamp is glowing, UV intensity drops after 8,000–10,000 hours of use (roughly 1 year). An annual UV lamp replacement is mandatory for microbial safety.