How Often to Change RO Filters? 4-Step Essential Schedule
Owning a water purifier is like owning a car. It runs great when it’s new, but without regular service, it will eventually break down. The most critical part of that maintenance is understanding how often to change RO filters.
Do you wait for the machine to stop working? Do you wait for the red alarm light? Or do you stick to a calendar?
Waiting too long is dangerous. According to the Water Quality Association (WQA), neglected filters can become a breeding ground for bacteria, meaning your “purifier” might actually be contaminating your water. On the other hand, changing them too early is a waste of money.
To help you save money and stay safe, here is our essential guide on how often to change RO filters for every part of your machine.
1. Pre-Filters (Sediment & Carbon)
Frequency: Every 3 to 6 Months
These are the “bodyguards” of your RO system. If you are wondering how often to change RO filters, start here. These are usually located outside the main machine or are the first stage inside.
- Sediment Filter: Traps physical dirt, mud, rust, and sand. In areas with muddy water (high turbidity) like parts of Patna or Jehanabad, these turn brown and choke very quickly.
- Pre-Carbon Filter: Removes chlorine and bad smells that can damage the sensitive RO membrane.
Why Change Them? If these get clogged, the water pressure drops, forcing your RO pump to work harder. Ignoring these cheap filters will lead to a burnt-out pump or a damaged RO membrane, which costs 10x more to fix.
2. The RO Membrane (The Heart of the System)
Frequency: Every 12 to 24 Months
The Reverse Osmosis (RO) membrane is the most important component. It removes dissolved solids (TDS), heavy metals, and viruses. When people ask how often to change RO filters, they are usually worried about this expensive part.
Its life depends entirely on your input water quality:
- Hard Water (TDS > 1000): Expect to change it every 12-15 months.
- Soft Water (TDS < 500): It can last up to 2 years with proper maintenance.
When to Change Immediately: If you test your water (see our guide on checking TDS) and the level is high, or if the water tastes salty, your membrane has failed.
3. Post-Carbon & Mineral Cartridges
Frequency: Every 12 Months
These filters polish the water right before it hits your glass. The post-carbon filter improves the taste, and the mineral cartridge adds healthy minerals like Calcium and Magnesium back into the water.
We recommend changing these once a year. It is a vital part of the schedule for how often to change RO filters to ensure your water always tastes fresh and sweet.
4. UV Lamp (If applicable)
Frequency: Every 12 to 24 Months
Even if the UV light is still glowing, its intensity fades over time. After a year or two, it may not be strong enough to kill bacteria effectively. It’s best to replace the lamp periodically to be safe.
Summary: Your Maintenance Cheat Sheet
| Part Name | Replacement Time |
|---|---|
| Sediment/Carbon Filter | 3 – 6 Months |
| RO Membrane | 12 – 24 Months |
| Post-Carbon / Mineral | 12 Months |
The Easiest Way to Handle Maintenance? Get an AMC.
Does remembering this schedule sound like a headache? It is. That’s why most smart homeowners opt for an Annual Maintenance Contract (AMC).
With an AMC plan from RO Sale & Services, you never have to worry about how often to change RO filters again. We track it for you.
- We call you when service is due.
- The cost of expensive filters (like the Membrane) is often included.
- You get priority support if anything breaks.
Stop worrying about dates and dirty water. Check out our affordable Water Purifier AMC Plans today and let us handle the dirty work.
If you think your filters are overdue for a change right now, don’t wait. Book a General Service Visit and our technician will inspect and replace them instantly.
