The Honest Shower-Filter Library
Learn — science, not marketing
We publish the research, comparisons and how-to guides we wish every shower-filter buyer had before purchasing. No staged magic, no fake soft-water claims — just what the media actually removes.
Buying Guides →
How to pick the right shower filter for your water, skin, and budget.
Water Science →
What is actually in your shower water — chlorine, chloramine, hardness, TDS.
Filtration Technology →
KDF-55, activated carbon, vitamin C — how shower-filter media work.
Technical & Standards →
NSF/ANSI 177, cartridge specs and the standards behind the claims.
Installation →
Step-by-step install for inline, handheld, and filtered showerheads.
Maintenance →
Cartridge replacement, leaks, and low-pressure fixes.
Comparisons →
Inline vs showerhead, KDF vs carbon, vitamin C vs KDF.
Research →
Lab notes, methodology and what the data actually shows.