---
product_id: 506868935
title: "Pentek Pentair RFC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Carbon (GAC) Filter, 20\" x 4.5\", 25 Micron, Pack of 6"
brand: "pentek"
price: "$1828.41"
currency: USD
in_stock: true
reviews_count: 1
category: "Pentek"
url: https://www.desertcart.us/products/506868935-pentek-pentair-rfc-20bb-big-blue-carbon-water-filter-20
store_origin: US
region: United States of America
---

# 100,000 gallon capacity Unique radial flow design NSF certified for safety Pentek Pentair RFC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Carbon (GAC) Filter, 20" x 4.5", 25 Micron, Pack of 6

**Brand:** pentek
**Price:** $1828.41
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your home’s water game with the power of pure, heavy-duty filtration!

## Quick Answers

- **What is this?** Pentek Pentair RFC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Carbon (GAC) Filter, 20" x 4.5", 25 Micron, Pack of 6 by pentek
- **How much does it cost?** $1828.41 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/506868935-pentek-pentair-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

- • **Radial Flow Innovation:** Low pressure drop design minimizes carbon fines release, ensuring cleaner water flow.
- • **Certified Peace of Mind:** NSF International tested and certified to guarantee top-tier filtration performance.
- • **Long-Lasting Performance:** Handles up to 100,000 gallons—replace annually or when water pressure drops.
- • **Pure Taste, Zero Compromise:** Effectively reduces sediment, chlorine taste, and odor for crystal-clear water.
- • **Universal Fit, Seamless Upgrade:** Fits all 20" Pentair Big Blue and compatible heavy-duty housings for easy replacement.

## Overview

The Pentek Pentair RFC-20BB is a 20-inch whole house carbon water filter cartridge featuring a granular activated carbon bed and a unique radial flow design that reduces sediment, chlorine taste, and odor. NSF certified and built for heavy-duty use, it fits all standard 20" Pentair Big Blue housings and delivers up to 100,000 gallons of cleaner, better-tasting water with minimal pressure drop.

## Description

Pentair Pentek RFC Series Cartridges are constructed with a 70-micron porous polyethylene outer shell and durable polypropylene endcaps. The 2-3⁄4" outer diameter cartridges have a polypropylene core and the 4-1⁄2" outer diameter cartridges incorporate a spun polypropylene core. Sandwiched between the outer shell and the core is a bed of granular activated carbon (GAC). The unique radial flow design offers the benefits of granular activated carbon (GAC) filtration, such as low pressure drop, while at the same time significantly reducing the release of carbon fines commonly associated with GAC-style cartridges. Pentek RFC Series Cartridges are available in a wide variety of sizes and are ideal for point-of-entry (POE) and other high flow rate applications.

Review: Been really happy with it, lasts about 1.5 months for a family of two. Unfortunately, my well water has a lot of sulfur and those filters help a lot with by completely removing the smell. I wish they were cheaper tho. Cannot wait to install contact tank with chlorine so I can fix my water cheaper than this option

## Features

- REDUCES SEDIMENT AND CHLORINE TASTE & ODOR to provide great tasting, clearer water
- FITS ALL 20" Pentair Pentek Big Blue or other 20" heavy duty filter housings and can replace any 20" x 4.5" carbon filter cartridge
- UNIQUE RADICAL FLOW DESIGN offers low pressure drop, while significantly reducing release of carbon fines commonly associated with GAC cartridges
- NSF INTERNATIONAL tested and certified for your peace of mind
- 100,000 GALLON CAPACITY. Replace every 1 year or when you notice a drop in water pressure or water quality

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09MSWW43N |
| Brand | Pentek |
| Color | White |
| Customer Reviews | 5.0 5.0 out of 5 stars (7) |
| Date First Available | 16 January 2023 |
| Item Weight | 13.3 Kilograms |
| Material | Polypropylene Polyethylene |
| Model Number | 155247-43-APC |
| Product Dimensions | 11.43 x 11.43 x 50.8 cm; 13.27 kg |

## Product Details

- **External testing certification:** NSF
- **Item weight:** 29.25 Pounds
- **Material:** Polypropylene Polyethylene
- **Product benefits:** Removes Pollutants
- **Product dimensions:** 11.4D x 11.4W x 50.8H centimeters

## Images

![Pentek Pentair RFC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Carbon (GAC) Filter, 20" x 4.5", 25 Micron, Pack of 6 - Image 1](https://m.media-amazon.com/images/I/61yeSLMKuQL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by I***Y on 3 February 2024*

Been really happy with it, lasts about 1.5 months for a family of two. Unfortunately, my well water has a lot of sulfur and those filters help a lot with by completely removing the smell. I wish they were cheaper tho. Cannot wait to install contact tank with chlorine so I can fix my water cheaper than this option

## Frequently Bought Together

- Pentair Pentek RFC-20BB Big Blue Carbon Water Filter, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Carbon (GAC) Filter, 20" x 4.5", 25 Micron, Pack of 6, White
- Pentair Pentek DGD-5005-20 Big Blue Water Filter, 20-Inch Whole House Sediment Filter Cartridge Replacement, Dual-Gradient Density Spun Polypropylene, 20" x 4.5", 5 Micron, Pack of 6, White
- Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-26*