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"

Shipped fast! Installed fast!Worked beautiful!

Hard to find in stores

No other filter I've tried in thirty years can match this filter's ability to clean water. I mean CLEAN! It removes EVERYTHING they say it will and leaves your water tasty and clear . . . for the most part. However, if you got any clay in your water, well, clay particles, as you may know, are, like, .0001 microns in size and will sail right through this filter and most others too. But, over, all it's a dandy filter.

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.

I only use Pentair filters, solid results, and long lasting, and great water quality

Working perfectly after replacing these on my well prefilters.

Had the same issues others had. Filter ‘blew’ out. Had small black carbon particles clogging all my faucet aerators and toilet valves. Spent hours cleaning out! Fairly sure I might have to drain my hot water heater also.