How come 1 is 50 dollars and a 2 pack is 200 dollars ?

I haven't purchased this item lately, the $200 2 pack may be a for 2 2 packs.

Will it fit a culligan installed filter housing - a bb gac 20 ??

The one I received was for a cullingan big blue filter collapsed blocking flow and putting a lot of charcoal granules through out system. I have used these filters for years with little problem ,it may have been a fluke

What does bb mean? is it different from the gac-20?

BB means that it is designed to fit our Big Blue housings which hold a 4 inch diameter cartridge rather than the standard 2.4 or 2.5 inch diameter cartridges. If you have additional questions, please reach out to our technical support team (USA based) at 800-279-9404.

How do you know when to change this filter?

Vincent, If this is a residential application this filter should be replaced approx. every 6 months - 1 year. Never past 1 year. If you smell or taste chlorine or have an odor in your water the filter should be replaced. Let us know if this helps. Thanks, Paul.

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Pentair GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5"

Product ID: 253578715

Details

External testing certification
NSF ANSI
Item weight
5 Pounds
Material
Activated
Product dimensions
11.6D x 49.7W

✅NSF certified for safety

💧25,000 gallon capacity

🛠️Fits all 20" Big Blue housings

137519CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Elevate your home hydration game with the Big Blue powerhouse!

ADVANCED CARBON TECH - Granular Activated Carbon maximizes contaminant adsorption for superior water quality.
POST FILTER PERFECTION - Built-in post-filter reduces carbon fines and suspended particles, ensuring crystal-clear water.
LONG LASTING PERFORMANCE - Filters up to 25,000 gallons—replace only every six months for hassle-free freshness.
PURE TASTE ZERO COMPROMISE - Effectively eliminates chlorine taste & odors for crisp, clean water.
UNIVERSAL FIT ULTIMATE CONVENIENCE - Compatible with all 20" Pentair Big Blue and similar heavy-duty housings.

The Pentek Pentair GAC-20BB is a 20-inch heavy-duty granular activated carbon water filter cartridge designed for whole-house filtration. Certified by NSF, it fits all standard 20" Big Blue housings and delivers up to 25,000 gallons of clean, odor-free water by effectively reducing chlorine taste, odors, and suspended particles. Its innovative design includes a post-filter to minimize carbon fines, ensuring consistently pure water for up to six months.

Specifications

ASIN	B0014C067K
Best Sellers Rank	#57,453 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #192 in Replacement Water Filters
Brand Name	Pentek
Customer Reviews	4.6 4.6 out of 5 stars (1,153)
External Testing Certification	NSF, ANSI
Global Trade Identification Number	00051678249437
Included Components	filter
Item Dimensions D x W x H	11.6D x 49.7W x 11.6H centimeters
Item Type Name	Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Whole House Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5"
Item Weight	5 Pounds
Manufacturer	Pentair Industries
Manufacturer Part Number	155249-43
Material Type	Activated Carbon
Model Number	GAC-20BB
Number of Items	1
Product Benefits	Reduces bad taste and odors, removes fine carbon particles and other suspended particles, NSF certified
Set Name	Pentek GAC-20BB Set
UPC	851905124281 051678249437
Unit Count	1 Count

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