In what way is this filter diffrrent (better?) than the gac-20bb? for whole house chlorine removal before a water softener.

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.

Would this work with other 20 x 4.5 filter systems, like a replacement for an american plumber wrc25hd20?

RandyYes this filter will work in other systems that take 4"x 20" filter

This filter is 1/2 " longer then the old one will it still work?

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.

Is this good enough for a spotless car wash filter?

The RFC can be used as pretreatment for equipment that actually provides spotless rinse. This filter in itself does not provide spotless rinse.

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RFC20-BB Carbon Filter Cartridge, 20" x 4-1/2"

Product ID: 361720778

Details

Material
Polyethylene
Product Dimensions
11.4D x 11.4W
Item Weight
1.13 kg
External Testing Certification
NSF ANSI
Product Benefits
Reduces

💧100,000 gal capacity

⚙️Radial flow tech

🛡️NSF/ANSI certified

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€ 220.47

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Sold byAmazon IrelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Elevate your home’s water game—because your family deserves the purest sip.

YEAR LONG FRESHNESS - Filters up to 100,000 gallons—enjoy cleaner water for a full year without hassle.
TASTE THE DIFFERENCE - Effectively reduces chlorine taste, odor, and sediment for crisp, refreshing water.
CERTIFIED PEACE OF MIND - NSF/ANSI Standard 42 certified for guaranteed safety and structural integrity.
PURE HYDRATION ZERO COMPROMISE - Advanced radial flow tech ensures max filtration with minimal pressure loss.
SEAMLESS FIT EFFORTLESS UPGRADE - Fits standard 20" Big Blue housings for quick, no-fuss installation.

The Pentek RFC20-BB Carbon Filter Cartridge is a high-capacity, 20" whole house water filter featuring advanced radial flow technology and granular activated carbon to reduce chlorine, sediment, and odors. With a 100,000-gallon capacity, it delivers up to one year of efficient filtration without sacrificing water pressure. Compatible with standard 20" Big Blue housings and NSF/ANSI Standard 42 certified, it ensures safe, reliable, and better-tasting water throughout your home.

Specifications

Material	Polyethylene (PE), Polypropylene (PP)
Product Dimensions	11.4D x 11.4W x 50.8H Centimeters
Item Weight	1.13 kg
External Testing Certification	NSF, ANSI
Product Benefits	Reduces Chlorine
Brand	pentek
UPC	051678247433
Global Trade Identification Number	00051678247433
Net Quantity	1.0 Count
Number of Items	1
Manufacturer	Pentair Industries
Country of Origin	USA
Item model number	RFC20-BB
ASIN	B003SRQG0U

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