If your RO purifier has ever slowed to a trickle, chances are the cartridge filter is overdue for a change. It's a small, inexpensive part, but it does most of the heavy lifting — catching dust, rust flakes and sediment before they ever reach your RO membrane. Pearl Water makes these filters from pure polypropylene using a melt-blown process, which is a fancy way of saying they hold more dirt and last longer than the flimsier alternatives you'll find on some marketplaces.
We stock both the standard 10 inch cartridge filter used in almost every home RO unit, and the 20 inch jumbo size for setups that need higher flow. Prices start at ?99, everything is ISO certified, and we ship across India.
Browse the range: 10 Inch Cartridge Filter · Pack of 3 · Pack of 10 · 5 Micron 20 Inch
Think of it as a bouncer standing at the door of your RO system. Water enters the filter housing, passes through the tightly wound layers of the cartridge, and comes out the other side stripped of visible particles — sand, silt, rust from old pipes, whatever your source water happens to be carrying that day. Nothing gets through except clean water. Skip this stage, or run it on an old, clogged filter, and those particles end up fouling your membrane, which is a far more expensive part to replace.
We've written a longer explainer if you want the full picture: What Is a Cartridge Filter in an RO Plant?
This is where most people get stuck, so here's the short version. The micron number tells you how small a particle the filter can trap — lower the number, finer the filtration, but also a slightly slower flow. There's no single "correct" size; it comes down to your water source.
Still unsure which one fits your setup? Talk to our team — or check the Cartridge Filter Housing page if you need a housing to go with it.
Most homes need nothing more than the standard 10 inch filter — it's what ships with the vast majority of RO purifiers sold in India, and replacements are easy to find. The 20 inch jumbo version comes into play when you need more flow, such as higher daily water usage or a light commercial setup, and it also means fewer filter changes over time. Both sizes go through the same manufacturing and quality checks, so it's really a question of fit, not quality.
RO purifiers are the obvious use case, but the same cartridges show up in quite a few other places: pharmaceutical and cosmetic production lines, textile dyeing, chemical processing, edible oil filtration, and even swimming pools — see our pool filter range if that's what brought you here.
Most filters need swapping every 2–3 months, though heavier sediment in your water can shorten that window considerably. Watch for:
For the full replacement walkthrough: Cartridge Filter — When to Replace It Also worth a read: Top 5 Cartridge Filters for Best Water Purification
How much does a 10 inch cartridge filter cost? Our 10 inch filters start at ?99 apiece, and work out cheaper per unit if you go for the Pack of 3 or Pack of 10.
Which micron rating should I buy for home use? 10 micron covers most household situations. If your water tends to carry a lot of sediment, pair a coarser 20–50 micron filter upfront with a finer 5 micron filter as a second stage.
How often does it actually need replacing? Roughly every 2–3 months, but that's a guideline, not a rule — go by water quality and flow rate rather than the calendar.
What's the real difference between the 10 inch and 20 inch versions? Size and capacity, mainly. The 10 inch is standard for home use; the 20 inch handles higher flow and needs changing less often.
Will this fit my existing RO purifier, whatever the brand? Yes — it's built to the standard 2.5 inch housing size, so it fits pretty much any RO or water purifier sold in India, regardless of brand.
I also need a housing, not just the filter — where do I find that? That's on our Cartridge Filter Housing page.
