Pentair Pentek GAC-BB Big Blue Carbon Water Filter, 10-Inch, Whole House Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 10" x 4.5"

Perfect fit. Was having issues with all the rain once replaced my water wa s better instantly

Works and fit fine.

Hard to find in stores

I purchase this filter every year for my whole house water filtration system. I live in an area where we have some of the hardest water around and a water filtration system is a must. This filter helps with filtering out some of the elements in our water and usually lasts about 8-12 months. Although, water pressure drops significantly after the 8 month mark and so that’s an indication for me to change it out. I have had some issues with the resin pouring out for the last 2 filter changes. That resin isn’t easy to clean up so that’s a negative for the product. Not sure why I have experienced that problem because in previous years there were no issues. Slight changes to materials maybe? Not sure, just speculation. Although, perhaps it’s because the filter is clogging and at the 8 month mark it’s probably time to change? I will be trying a different filter next year and see if that one works better. I will also check the filter at the 7-1/2 month mark to see if the resin is already seeping. Overall, the filter helps clean out water so no complaints there but I wish it didn’t have the pressure drop.

I accidentally purchased this blue GAC-20BB filter instead of my usual RFC-20BB whole house filter which claims to allow more pressure through. I was worried at first but given I had already opened the blue filter anyhow I figured I'd try it. I have not noticed any pressure decrease from the usual and showers are just fine. Writing this review to tell others not to worry. I'll make sure to get the RFC next time.

Easy install. Make sure you have some spare gaskets for your Big Blue. Need to rinse several gallons of water through the filter before the water is clear of charcoal, but that's expected. I like that this filter can provide full faucet flow rate so that nobody is waiting for a glass of water. The best part is that the water tastes great!

Shipped fast! Installed fast!Worked beautiful!

Two weeks ago I had to call off work because at 5am when I got up, I found my 3 part water filter gushing water all over my garage turned into a gym. Took 12 hours to vacuum all the water up and dry the house (water went into 3 rooms). Turns out one of the housing cracked at the top. Not the bottle that holds the filter, but the top part, the black bottle holder. Fortunately, I built a bypass so I've been on city water. Now two weeks later I finally have time to replace the broken parts and when I took the bottle off, I discovered the culprit - THIS FILTER! It cracked down the side releasing all the carbon bits, expanding the bottle and bottle holder beyond their capability. Coincidentally, I bought this same filter last year and it only made it a few months. That time it junked-up everything with carbon. I took it out and just the empty bottle. I figured it was a fluke and tried again. So now that's over 100 dollars on this absolute garbage filter!