The water journal
Science-backed reading on water, skin and hair.
What is actually in shower water, what it does to a skin barrier, and how to tell a real filter from a plastic tube with charcoal in it.
The latest from the journal.
KDF-55 vs Vitamin C Shower Filter: Which Is Better?
KDF-55 vs Vitamin C Shower Filter: Which Is Better? TL;DR: Neither is universally "better" — they target different contaminants. KDF-55 excels at chlorine removal + heavy metals and...
Read article →Can Shower Water Make Perimenopause Symptoms Worse?
Can Shower Water Make Perimenopause Symptoms Worse? TL;DR: Yes. Perimenopause causes a 35% decline in your skin's natural moisture barrier due to falling estrogen. When you shower in...
Read article →Hard Water Map: Check Your City's Water Hardness Level
Hard Water Map: Check Your City's Water Hardness Level TL;DR: 85% of American homes have hard water (above 60 mg/L calcium carbonate). The hardest water in the US...
Read article →Chlorine in Shower Water: How Much Are You Actually Absorbing?
Chlorine in Shower Water: How Much Are You Actually Absorbing? TL;DR: A 10-minute hot shower exposes you to more chlorine than drinking 8 glasses of tap water. You...
Read article →Does Water Pressure Drop with a Shower Filter? (Real Test Results)
Does Water Pressure Drop with a Shower Filter? (Real Test Results) TL;DR: A quality shower filter reduces water pressure by only 3-8% (barely noticeable). Poorly designed filters can...
Read article →Shower Filter for Hair Loss: Does It Actually Help? (Evidence-Based)
Shower Filter for Hair Loss: Does It Actually Help? (Evidence-Based) TL;DR: A shower filter cannot cure genetic hair loss (androgenetic alopecia), but it can significantly reduce hair breakage...
Read article →How Often Should You Replace Your Shower Filter? (Honest Answer)
How Often Should You Replace Your Shower Filter? (Honest Answer) TL;DR: Most shower filters should be replaced every 2-3 months (60-90 days) for a household of 1-2 people....
Read article →What Does a Shower Filter Remove? (Complete Contaminant List)
What Does a Shower Filter Remove? (Complete Contaminant List) TL;DR: A quality multi-stage shower filter removes chlorine (99%), chloramines, heavy metals (lead, mercury, iron, copper), sediment (rust, sand,...
Read article →Eskiin vs Jolie vs Unchemed: Which Shower Filter Actually Works Best?
Eskiin vs Jolie vs Unchemed: Which Shower Filter Actually Works Best? TL;DR: Jolie excels at chlorine removal with KDF-55 ($165). Eskiin uses Vitamin C for chlorine/chloramine neutralization ($89)....
Read article →Jolie Shower Filter Review 2026: Is It Worth $165?
Jolie Shower Filter Review 2026: Is It Worth $165? TL;DR: The Jolie Filtered Showerhead uses quality KDF-55 and Calcium Sulfite media that effectively removes chlorine. However, at $165...
Read article →Best Filtered Shower Head of 2026 (Tested & Compared)
Best Filtered Shower Head of 2026 (Tested & Compared) TL;DR: The best filtered shower head of 2026 is one that uses multi-stage filtration (KDF-55 + Calcium Sulfite +...
Read article →PFAS in Your Shower Water: Should You Be Worried?
TL;DR: Yes, you should be concerned about PFAS ("forever chemicals") in your shower water. While drinking PFAS-contaminated water is the primary risk, hot showers pose a secondary risk...
Read article →Get your water report first.
Find your water supplier’s latest public report through the EPA directory. Search by state and supplier to see what was detected in your public water system.
Find my water report →Free access to public water reports.
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