These are effective replacements for 3US-PF01 Filtrete high capacity, under-sink filtration systems.
We have water with a heavy mineral content in this part of Jefferson City, MO. It means the water has a OK taste, but not really good, kind of a dusty flavor. So, since I drink a lot of water and make a lot of ice trays, I wanted something to make the experience better.
Hence, I installed the Filtrete system. I knew the filters were expensive, running at around $50 a pop, plus tax, but for good-tasting water, it was better than a pitcher or a Pur system, for my money. The long-life filter is designed to go six months, or over 1000 gallons of water. That's 10 Pur filters, by the way, or $140 worth of filters!
The water tastes good, and makes really good ice cubes. It also improves the flavor of meals that need water in cooking. The water flow is also better than a Pur faucet filter, due to the extra size and filtration capacity. Well worth the money.
These filters are easy to change, too. I have my unit installed just inside my right under-sink cabinet, against the side wall. This allows easy changes without blocking access or requiring that I get down on hands and knees to make changes. A simple ? twist to the left to unseat the filter, then pull it down and out. A few drops of water will drip, but cleanup is easy, no big messes. Then press the new filter onto the stem, and twist to the right to seat it. Run for 10 minutes to fill and flush the filter, then take a sticker and either place it on the filter, or a more visible place if desired.
I take and go six months into my phone calendar and set a reminder to change the filter six months later, and set it to Repeat every six months later. Very handy to do that!