Why Does My RO Water
Smell Bad?

In most homes a bad smell is not an emergency, but it is a clear sign that your purifier needs attention. A smell means the water is no longer being cleaned the way it should be — so even if it looks clear, it’s best not to drink it until the cause is fixed.

The smell often tells you the likely cause:

• Chlorine / medicine smell — carbon filter is exhausted and letting chlorine through.
• Musty / earthy smell — biofilm or algae in the storage tank or pipes.
• Rotten-egg / sulphur smell — hydrogen sulphide in the source water, or bacteria in a dirty tank.
• Fishy / stale smell — water sitting too long, or organic matter past a tired membrane.

Fixing it early is cheaper — a small odour ignored for months can turn into a full filter-and-tank job later.

Before booking a visit, these safe steps often clear a mild smell — and help you describe the problem to us:

• Flush the system — run 2–3 glasses of water and throw them away, especially after being away for a few days.
• Empty a stagnant tank — if the RO was unused, drain the stored water fully and let it refill fresh.
• Check when it smells — only the first glass, or every glass? First-glass-only usually means stagnant water; every glass points to a filter or membrane.
• Look at the service date — if it’s been more than 6–12 months since a filter change, that’s very likely the cause.
• Check the UV indicator (if your model has one) — a light that’s off can mean the UV lamp needs replacing.
• Wipe the tap & nozzle — sometimes the smell is only at the outlet, not in the water.

Please don’t open the membrane housing or add cleaning chemicals yourself — the wrong product can damage the membrane and void warranty.

Book a Navsari technician if:

• The smell is still there after flushing and draining the tank.
• It smells like rotten eggs or sewage — this needs proper diagnosis of the water and tank.
• It’s been over a year since your last filter/membrane service.
• The water also tastes off, looks cloudy, or the flow has dropped.
• Your UV lamp indicator is off or the unit is beeping.

A technician will identify the exact cause — carbon filter, membrane, tank clean or UV lamp — and tell you the price before any work begins. See our RO repair in Navsari page, or book a full RO service in Navsari to clean and refresh the whole system.