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: 253575592

Details

Brand
Pentek
External testing certification
NSF ANSI
Item weight
1.13 kg
Material
Granular
Product benefits
Reduces

💧25 Micron filtration precision

🔄Radial Flow design for low pressure drop

🛡️NSF certified for trusted safety

HK$2954

Duties & taxes included

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Description

💧 Elevate your water game with every drop—because your home deserves the best!

CERTIFIED PEACE OF MIND - NSF International certified, ensuring your water meets the highest safety and quality standards.
CRYSTAL CLEAR HYDRATION - Reduces sediment, chlorine taste & odor for pure, refreshing water every time.
RADICAL FLOW INNOVATION - Unique radial flow design minimizes pressure drop and carbon fines for smooth, clean water flow.
LONG LASTING PERFORMANCE - Impressive 100,000-gallon capacity means you replace less and enjoy more—up to 1 year of premium filtration.
UNIVERSAL FIT ZERO HASSLE - Fits all 20" Pentair Pentek Big Blue and other heavy-duty housings—easy swap, no stress.

The Pentek 155247-43 RFC-20BB is a 20" x 4.5" granular activated carbon filter cartridge designed for whole-house filtration. Featuring a 25-micron filtration rating and a unique radial flow design, it reduces chlorine taste, odor, and sediment while maintaining low pressure drop. NSF certified and boasting a 100,000-gallon capacity, this filter fits all standard 20" heavy-duty housings, delivering cleaner, better-tasting water for up to one year.

Specifications

ASIN	B003SRQG0U
Best Sellers Rank	#21,554 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #68 in Replacement Water Filters
Brand	Pentek
Brand Name	Pentek
Customer Reviews	4.6 out of 5 stars 727 Reviews
EU Spare Part Availability Duration	1 Years
External Testing Certification	NSF, ANSI
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 centimeters
Item Highlight	Granular Activated Carbon Reduces Chlorine Taste and Odor Whole-House; 20" x 4.5", 100,000-Gallon Capacity
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
Item weight	2.5 Pounds
Manufacturer	Pentair Industries
Manufacturer Part Number	155247-43
Material	Granular Activated Carbon
Material Type	Granular Activated Carbon
Model Number	RFC20-BB
Number of Items	1
Number of Packs	1
Product Benefits	Reduces Chlorine
Product benefits	Reduces Chlorine
Product dimensions	11.4D x 11.4W x 50.8H centimeters
Set Name	Single Water Filter Cartridge
UPC	051678247433
Unit Count	1.0 Count

Reviews

D**.

Water filter

Great filter

27.08.2026

A**R

Best value of any place I've found.,

Carbon helps to purify aft er the first filter takes the chunks out. LOL

25.10.2025

A**R

Excellent

This is my second purchase and they fit perfectly into the acrylic cylinders/holders. Will purchase again. Thank you

16.11.2018

N**H

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 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!

19.04.2025

P**E

parfait

produit parfait

5.10.2022

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The delivery time was excellent, and the packaging was secure.

2 months ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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