Post Carbon Filter: The Final Touch for Pure and Great-Tasting Water
When it comes to clean, safe, and great-tasting water, the post carbon filter plays a silent but essential role. It’s often the last stage in a multi-stage RO or UV water purifier, designed specifically to remove any remaining odors, improve taste, and ensure water is as fresh and pure as possible before reaching your glass.
In this article, we’ll explain what a post carbon filter is, how it works, why it’s important, and how much a post carbon filter costs in India.
What is a Post Carbon Filter?
A post carbon filter, also known as a polishing filter, is typically placed after the RO membrane in a water purifier. Unlike pre-filters that trap physical sediments or chlorine, the post carbon filter uses activated carbon (often made from coconut shell) to adsorb any remaining chemical contaminants, odors, and unpleasant tastes that may linger after filtration.
It doesn’t change the TDS of the water but significantly improves the taste, smell, and color, making it ideal for drinking and cooking purposes.
How Does a Post Carbon Filter Work?
Post carbon filters work through a process called adsorption. The activated carbon inside has millions of microscopic pores that trap chemical particles and organic compounds. This final stage removes:
Chlorine remnants

Pesticides or herbicides

Volatile organic compounds (VOCs)

Any foul taste or odor

Color-causing impurities

The result is crystal-clear, fresh-tasting water that is both healthy and palatable.
Why Is a Post Carbon Filter Important?
Even the best RO systems sometimes leave water tasting flat or slightly chemical-like. This is where the post carbon filter makes a big difference:
✅ Enhances Water Taste: Makes water sweet, fresh, and more drinkable.

✅ Neutralizes Odor: Eliminates bad smells caused by chlorine or organic matter.

✅ Polishing Effect: Gives final shine and purity to already filtered water.

✅ Protects Your Health: By removing any lingering harmful chemicals.

✅ Affordable & Easy to Replace: Low cost and user-friendly.

Whether you have a domestic RO purifier or a commercial water setup, the post carbon filter is essential for ensuring taste quality and user satisfaction.
Post Carbon Filter Price in India
The post carbon filter price varies based on brand, size, quality of carbon, and type (inline or loose). Here’s a breakdown of the common price ranges:
Type
Price Range (INR)
Features
Loose Carbon Refill
₹100 – ₹200
For DIY filter packing or open housing use
Inline Post Carbon Filter
₹150 – ₹500
Sealed, easy to install, widely used in RO
Branded Cartridges
₹300 – ₹700
Premium filters with NSF-certified carbon

Popular Brands
Some popular and trusted brands offering quality post carbon filters in India include:
Aquaguard

Kent

Livpure

Konvio Neer

Blue Star

Generic RO-compatible inline filters

Many generic models are also compatible with major RO systems, offering good quality at lower prices.
When to Replace a Post Carbon Filter?
Post carbon filters typically last 9 to 12 months depending on:
Water quality

Usage volume

RO system efficiency

If you notice a change in taste, odor, or water flow, it’s a sign that your filter may need replacement. Delaying can cause bad taste and may even allow chemical residues to reach your drinking water.
Installation Tips
Most inline post carbon filters come with ¼ inch pipe fittings that can be easily installed with a spanner.

Always flush the new filter with water for 3–5 minutes before use.

Mark the installation date to keep track of replacement time.

Where to Buy Post Carbon Filters?
You can purchase post carbon filters online via platforms like Amazon, Flipkart, and industry sites like Pearl Water Technologies or your RO purifier brand’s official website. Local RO service centers also stock replacement filters.
Buying online allows you to compare post carbon filter prices, read reviews, and even buy in combo packs with pre-filters and sediment cartridges.
Conclusion
While often overlooked, the post carbon filter plays a vital role in ensuring your water isn’t just clean—but also tastes great. Its ability to remove odors and enhance flavor makes it a crucial part of any RO water purifier system.
The good news? It’s an affordable, easy-to-replace component, typically costing between ₹150 and ₹500. With timely replacements, you can enjoy fresh, sweet, and safe drinking water all year round.
Whether you’re upgrading your home RO system or simply doing routine maintenance, don’t ignore the importance of your post carbon filter—your taste buds will thank you.
FAQs
Q1. What is the function of a post carbon filter in a water purifier?
A: It removes any remaining odors, organic compounds, and unpleasant taste after RO filtration, giving water a clean, fresh finish.
Q2. How often should I replace my post carbon filter?
A: Ideally every 9 to 12 months, depending on water quality and usage.
Q3. Is post carbon filter necessary in an RO purifier?
A: Yes, it’s essential to improve the taste and quality of RO-filtered water, which can sometimes be flat or tasteless without it.
Q4. What is the post carbon filter price in India?
A: It ranges from ₹150 to ₹500 for standard inline filters and can go up to ₹700 for branded models with certified activated carbon.