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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Pentek - 155247-43 RFC-20BB Carbon Filter (20" x 4.5"), 25 Micron

Pentek - 155247-43 RFC-20BB Carbon Filter (20" x 4.5"), 25 Micron

Product ID: 349244447

Details

External testing certification
NSF ANSI
Item weight
1.13 kg
Material
Carbon Fibre
Product benefits
Reduces Taste
Product dimensions
11.4D x 11.4W

⚡2 GPM high flow rate

💧25 micron sediment filtration

🌡️40-125°F temperature range

€ 415.74

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Description

💧 Elevate your water game—because your home deserves the freshest flow!

UNIVERSAL FIT - Compatible with most standard 20-inch Big Blue housings for easy upgrade and replacement.
EFFORTLESS FLOW - Radial flow design ensures high water flow at low pressure drop—perfect for whole-home use.
BUILT TO PERFORM - Operates efficiently across a wide temperature range (40-125°F) to suit diverse household needs.
PRECISION FILTRATION - 25 micron rating captures sediment, delivering cleaner water without sacrificing speed.
CRYSTAL CLEAR HYDRATION - Effectively reduces chlorine, taste, and odor for pure, refreshing water every time.

The Pentek RFC-20BB Carbon Filter is a 20-inch, 25-micron rated cartridge designed to reduce chlorine, taste, odor, and sediment in residential water systems. Featuring a radial flow design, it delivers up to 2 gallons per minute with minimal pressure drop, fitting most standard Big Blue housings. Certified to NSF/ANSI standards for material safety, it operates efficiently between 40 and 125°F, making it ideal for whole-home filtration setups.

Specifications

ASIN	B003SRQG0U
Benefits	Reduces Chlorine, Taste, and Odor; Removes Sediment; High Flow Rate
Brand Name	Pentek
Customer Reviews	4.6 4.6 out of 5 stars (726)
External Testing Certification	NSF, ANSI
Global Trade Identification Number	00051678247433
Item Dimensions D x W x H	11.4D x 11.4W x 50.8H centimetres
Item Weight	1.13 kg
Manufacturer	Pentair Industries
Manufacturer Part Number	155247-43
Material Type	Carbon Fibre
Model Number	RFC20-BB
Number of Items	1
UPC	051678247433
Unit Count	1.0 count

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