---
product_id: 11468779
title: "Pentair Pentek RFC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Activated Carbon (GAC) Filter, 20\" x 4.5\", 25 Micron"
brand: "pentek"
price: "HK$1649"
currency: HKD
in_stock: true
reviews_count: 8
category: "Pentek"
url: https://www.desertcart.hk/products/11468779-pentair-pentek-rfc-20bb-big-blue-carbon-water-filter-20
store_origin: HK
region: Hong Kong
---

# 100,000 gallon capacity Radial flow tech for low pressure drop Fits standard 20" Big Blue housings Pentair Pentek RFC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Activated Carbon (GAC) Filter, 20" x 4.5", 25 Micron

**Brand:** pentek
**Price:** HK$1649
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your water game—taste the difference, feel the flow!

## Quick Answers

- **What is this?** Pentair Pentek RFC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Activated Carbon (GAC) Filter, 20" x 4.5", 25 Micron by pentek
- **How much does it cost?** HK$1649 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/11468779-pentair-pentek-rfc-20bb-big-blue-carbon-water-filter-20)

## Best For

- pentek enthusiasts

## Why This Product

- Trusted pentek brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Flow:** Radial flow design keeps water pressure high while filtering deeply
- • **Whole Home Purity:** Eliminates chlorine taste & odor for fresher water everywhere
- • **Year-Long Performance:** Filters up to 100,000 gallons before replacement—set it and forget it
- • **Certified Peace of Mind:** NSF/ANSI 42 certified for safety and structural integrity
- • **Plug & Play Compatibility:** Fits most 20" Big Blue housings for seamless upgrades

## Overview

The Pentair Pentek RFC-20BB is a 20-inch whole house carbon water filter cartridge featuring advanced radial flow technology and granular activated carbon. It reduces chlorine taste, odor, sediment, and contaminants while maintaining water pressure. With a 100,000 gallon capacity, it delivers up to one year of reliable filtration. Compatible with standard 20" Big Blue housings and NSF/ANSI 42 certified, it ensures safer, better-tasting water throughout your home.

## Description

Upgrade your home's water quality with the Pentair Pentek RFC-20BB Whole House Carbon Water Filter. This high-capacity filter utilizes advanced radial flow technology and granular activated carbon (GAC) to effectively reduce chlorine taste and odor, sediment, and other contaminants from your water supply. The unique design ensures low pressure drop and minimizes carbon fines, providing efficient filtration without sacrificing water pressure. With a 100,000 gallon capacity, this filter offers long-lasting performance for up to one year before replacement is needed. Compatible with standard 20" Big Blue filter housings, the RFC-20BB is ideal for whole house filtration systems and point-of-entry applications. Constructed with a 70-micron porous polyethylene outer shell, polypropylene core, and durable endcaps, this filter is built to withstand the demands of whole house filtration. NSF/ANSI Standard 42 certified for material safety and structural integrity, the Pentair Pentek RFC-20BB delivers cleaner, better-tasting water throughout your entire home with confidence and reliability.

Review: The best filter ever! - I was able to order this filter originally through Vine. It was the best filter we've used to date, so I went to desertcart and purchased another, just to make sure we always have one on hand. Our vacation place is on the VA coast and anyone who has lived near the water knows how skanky well water can be near the coast. This filter is truly exceptional. Our water has never tasted better. It immediately got rid of that low-tide smell typical of water in our area. We've tried paper filters, carbon filters and magnesium filters. This filter is what we had been needing. So glad I was introduced to it via Vine. I will continue to purchase more through desertcart Prime. Pricey but worth it!
Review: Does the job - Arrived great condition and works well as a replacement filter.

## Features

- CLEANER, BETTER-TASTING WATER: Effectively reduces chlorine taste and odor, sediment, and other contaminants for improved water quality throughout your entire home
- HIGH-PERFORMANCE DESIGN: Unique radial flow technology ensures low pressure drop and minimal carbon fines, providing efficient filtration without sacrificing water pressure
- LONG-LASTING FILTRATION: 100,000 gallon capacity offers up to one year of whole house water filtration before replacement is needed
- VERSATILE COMPATIBILITY: Fits standard 20" Big Blue filter housings and replaces most 20" x 4.5" carbon cartridges for easy installation and maintenance
- CERTIFIED QUALITY: NSF/ANSI Standard 42 certified for material safety and structural integrity, ensuring reliable performance and peace of mind

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Pentek |
| External Testing Certification | NSF, ANSI |
| Item Weight | 2.5 Pounds |
| Material | Granular Activated Carbon |
| Product Benefits | Removes Odor |
| Product Dimensions | 4.5"D x 4.5"W x 20"H |

## Product Details

- **External Testing Certification:** NSF, ANSI
- **Item Weight:** 2.5 Pounds
- **Material:** Granular Activated Carbon
- **Product Benefits:** Removes Odor
- **Product Dimensions:** 4.5"D x 4.5"W x 20"H

## Images

![Pentair Pentek RFC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Activated Carbon (GAC) Filter, 20" x 4.5", 25 Micron - Image 1](https://m.media-amazon.com/images/I/61Da7aesdRL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: In what way is this filter diffrrent (better?) than the gac-20bb? for whole house chlorine removal before a water softener.**
A: These are both carbon filters, and will fit the same housings, the main difference is how they are constructed, which affects the performance.
RFC20-BB filters offer a radial flow design which greatly reduces the pressure drop (RFC20-BB is rated at 0.9 psi pressure drop at 4 gpm,  while the GAC-20BB you are comparing to is rated at 10 psi pressure drop @ 4gpm).
The RFC20-BB filters also have a higher filtration capacity.  RFC20-BB are rated at >100,000 gallons of chlorine taste and odor reduction at 4gpm,  while the GAC-20BB are rated at 25,000 gallons.

**Q: Would this work with other 20 x 4.5 filter systems, like a replacement for an american plumber wrc25hd20?**
A: RandyYes this filter will work in other systems that take 4"x 20" filter

**Q: This filter is 1/2 " longer then the old one will it still work?**
A: This filter is designed to fit into the 10 inch Big Blue filter housings which is similar in size to most other 10 inch heavy duty filter housings.  We have not made changes to the length of these cartridges, so if you had this model previously, it should still fit correctly.  Not knowing what specific housing you have, I cannot for certain tell if this cartridge will fit.  If you would like further details, please reach out to our technical support team (USA based) at 800-279-9404.

**Q: Is this good enough for a spotless car wash filter?**
A: The RFC can be used as pretreatment for equipment that actually provides spotless rinse. This filter in itself does not provide spotless rinse.

## Customer Reviews

### ⭐⭐⭐⭐⭐ The best filter ever!
*by N***H on April 19, 2025*

I was able to order this filter originally through Vine. It was the best filter we've used to date, so I went to Amazon and purchased another, just to make sure we always have one on hand. Our vacation place is on the VA coast and anyone who has lived near the water knows how skanky well water can be near the coast. This filter is truly exceptional. Our water has never tasted better. It immediately got rid of that low-tide smell typical of water in our area. We've tried paper filters, carbon filters and magnesium filters. This filter is what we had been needing. So glad I was introduced to it via Vine. I will continue to purchase more through Amazon Prime. Pricey but worth it!

### ⭐⭐⭐⭐⭐ Does the job
*by C***A on November 2, 2025*

Arrived great condition and works well as a replacement filter.

### ⭐⭐⭐⭐⭐ water filter
*by D***N on December 14, 2025*

excellent product

## Frequently Bought Together

- Pentair Pentek RFC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Activated Carbon (GAC) Filter, 20" x 4.5", 25 Micron
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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-27*