- Pentair Pentek GAC-20BB Big Blue Carbon Water Filter, 20-Inch, Heavy Duty Granular Activated Carbon (GAC) Replacement Cartridge, 20" x 4.5", Pack of 4

perfect repacement, good price for this filter, it was 2x the price at dealer, no issues.

I had a DIY dual filter setup with Pentek 158643 3/8" #10 3G Slim Line Clear Filter Housings for my cold sink water. A while back I downgraded to the cheap generic filters, and noticed a huge downgrade in taste. It was not drinkable water. So to fix it, I added a third Pentek filter housing, and went back to what worked- genuine Pentek filters. The sediment filter I had didn't seem to fit properly, I don't think it sealed at all, so I ditched that completely and used a cheap but working DuPont WFPFC8002 Universal Whole House Carbon Wrap 2-Phase Cartridge as a sediment filter. Second in line I swapped the $6.50 DuPont with the $9.63 Pentek CBC-10 Carbon Block Filter Cartridge, 9-3/4" x 2-7/8", 0.5 Micron, a solid secondary filter w/ a perfect fit. The Pentek feels like it weighs 3x as much as the Dupont, no question it's worth the few extra dollars. The third and final filter was the hardest decision. I have tried both the Pentek ChlorPlus 10 Carbon Block Filter Cartridge, 10" x 2-1/2", 1 Micron, and the Pentek CC-10 Coconut Carbon Drinking Water Filters (9.75" x 2.875"), both of which were fantastic, make a noticeable difference to the taste of the water, and costs about $15-20. Instead, I went with a $12 option, the Pentek GAC-10 Drinking Water Filter (9-3/4" x 2-7/8"), hoping it would deliver similar results, especially considering the town water is fairly clean to begin with, ppm around 48. Would probably go with the CC-10 next time, but I'm very happy with the current results. The Pentek filter and housing combo really restored my drinking water back to amazing. Neighbors knock at my door with 5 gallon jugs because they can taste the difference too.

Glad to find these on Amazon.

There is a reason why they cost a bit more than most. They have a lot of granular carbon. You get what you pay for.. I have yet to install them in my 5 stage watts RO system. which has been resulting in 4ppm. for one year prior to changing all filters... The RO dow tech membrane i only replace every 5 years... my pre sediment is 1 micron ...

These are "odor and taste" water filters comprised of granulated activated carbon. The work great, but MUST be preceded by pleated paper filters (also sold by Pentair). The paper filters remove particulates which would quickly clog these more expensive filters. We have been using both for about 30 years (only recently bought them from Amazon). We have well water containing manganese oxide--a fine black material. How long do they last? That depends on how much water you use. But, we find changing the paper filter quarterly, allows us to change the carbon filter every 6-8 months. Finally, to use these filters you must also buy the containers they fit into and plumb the system into your water supply. Strongly, recommend putting in a bypass so you still can have water while someone in your family is replacing the cartridge. Also be sure to have a drain, so you can the drain the holders. For us, the process takes 30-45 minutes depending on whether we are replacing one or both filters and whether we have been good and not allowed them to get too fouled. Cleaning out the cartridge holder is the most time-consuming part of the job. And, remember when you remove the top, the filters are filled with water. So be prepared. Have a medium garbage bag at the ready for the spent filter. And, have lots of paper towels. Last tip, don't lose that o-ring. Be sure to clean it thoroughly and the groove it sits in. Then use Vaseline liberally to grease it before reinstalling it. Invest in a big jar of the generic stuff from CVS, etc. Not fun, but worth the effort if you want clear, good tasting water.

I like it

Product works just fine. But be careful with newer faucets with the BS water restrictions as it will slightly restrict water flow. But regardless it does what it says tast and oder

A perfect fit for our RV water filter. It fit like a original equipment and was an easy install. Did the usual flush which ran some black carbon out as it’s supposed to. So, at least I know there is carbon in it and it is likely doing its job. Will buy again.

OK

Wird seit 40 Jahren mit Erfolg eingesetzt.

In summer it removes the slight earthly and chlorine taste in the water.

This is a great filter to use, its one of the best. Price is extremely high! One unhappy customer!!! Not talking about this seller another seller!

Not only do I like this product, I have used this type and brand of water filter for the past eight years as my plumber told me this filter is the best type of filter to use. This is the first time I have ordered the filter from Amazon and the company that sent them. As I wrote on the company's website I am totally satisfied with no only the price of the filter but more important the quick service of delivering the product directly to my home. I will be ordering from this company in the future.