I can get 1 and or 2 micron carbon blocs, I use them on aquarium systems.
The issue is in a home using way more water than a aquarium it will clog or load in a few months (2-3), but if you don't mind the cost yes I can get them.
Generally WHF are 10-15 microns in the final stage.
5 is considered a very fine element eliminating most debris and chemicals.
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