Better Taste and Smell
From what I’ve seen, carbon block cartridges are usually the first thing to look at when the main problem is taste and odor. I changed ours after noticing that tea and coffee were picking up a slight chemical taste, and the difference was pretty obvious. I’d check the micron rating, whether the cartridge is made for chlorine or chloramine reduction, and whether it fits a standard housing size like 2.5x10 if you already have an undersink setup. I also came across this stainless steel water filter housing while comparing options, and it made me pay more attention to cartridge compatibility and NSF/ANSI 42 certification instead of just buying whatever looked cheapest.
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A lot depends on what is actually causing the smell in the first place. Some households only need a basic taste-and-odor cartridge, while others need something more specific for treated municipal water. It is also worth replacing cartridges on schedule, because an old filter can make good equipment seem worse than it really is.