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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Pentair Pentek RFC-20BB Big Blue 20" x 4.5" Carbon Water Filter, 25 Micron

Product ID: 11468779

Details

External Testing Certification
NSF ANSI
Item Weight
2.5 pounds
Material
Granular
Product Benefits
Removes Odor
Product Dimensions
4.5"D x 4.5"W

💧100,000 gallon capacity

⚙️Radial flow tech for low pressure drop

🛡️NSF/ANSI Standard 42 certified

€ 241.87

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Description

💧 Elevate your home’s water game—because your family deserves the best sip every time.

YEAR LONG FRESHNESS - Filters up to 100,000 gallons—enjoy cleaner water for a full year before replacement.
CERTIFIED CONFIDENCE - NSF/ANSI Standard 42 certification guarantees safety, durability, and reliable performance.
TASTE THE DIFFERENCE - Effectively reduces chlorine taste, odor, and sediment for crisp, refreshing water throughout your home.
PURE HYDRATION ZERO COMPROMISE - Advanced radial flow tech ensures powerful filtration without losing water pressure.
SEAMLESS FIT EFFORTLESS UPGRADE - Compatible with standard 20" Big Blue housings for quick, hassle-free installation.

The Pentair Pentek RFC-20BB is a high-capacity 20" x 4.5" carbon water filter featuring granular activated carbon and unique radial flow technology. It reduces chlorine taste, odor, and sediment while maintaining water pressure, with a 100,000 gallon capacity lasting up to one year. Compatible with standard Big Blue housings and NSF/ANSI Standard 42 certified, it delivers reliable, whole-house water filtration for cleaner, better-tasting water.

Specifications

ASIN	B003SRQG0U
Best Sellers Rank	#10,766 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #78 in Replacement Under-Sink Water Filters
Brand Name	Pentek
Customer Reviews	4.7 4.7 out of 5 stars (1,061)
EU Spare Part Availability Duration	1 years
External Testing Certification	NSF, ANSI
Global Trade Identification Number	00051678247433
Item Dimensions D x W x H	4.5"D x 4.5"W x 20"H
Item Type Name	20-Inch, Whole House Heavy Duty Radial Flow Carbon Replacement Cartridge with Granular Activated Carbon (GAC) Filter, 20" x 4.5", 25 Micron
Item Weight	2.5 pounds
Manufacturer	Pentair Industries
Manufacturer Part Number	155247-43
Material Type	Granular Activated Carbon
Model Number	RFC20-BB
Number of Items	1
Product Benefits	Removes Odor
Set Name	Single Water Filter Cartridge
UPC	051678247433
Unit Count	1 Count

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€ 241.87

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Slovakia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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