Head Filter 2-pack
Vitamin C Replacement Shower Filter
- Removes 99.9% of chlorine and chloramines via Vitamin C gel matrix
- Dual-stage: Vitamin C gel matrix + 5-micron PP sediment mesh (NSF/ANSI 42 certified*)
- Fits THE SECOND SHOWERHEAD (wall-mount) only
- Replace every 2–4 months — the Truth Window shows when
- Subscribe for $36 every 120 days (save $3)
- Open the showerhead housing by twisting counterclockwise
- Remove the old filter
- Insert the new filter with the wider end facing the handle
- Close the housing — hand-tighten only
The proof
Real filters from real showers.
See what your water left behind.
Before
After 21 daysI always thought our water was pretty good. Three weeks later the filter looked like that, so I guess not.
Using the Second Showerhead
Before
After 30 daysI didn't expect much, but my face wasn't as tight after showers. Even my derm noticed it looked less irritated.
Using the Second Showerhead
Before
After 30 daysAfter a month in Miami the cartridge looked nasty. It made me rethink what I was showering in every morning.
Using the Second Showerhead
Before
After 40 daysChicago water always felt harsh, but seeing the filter after 40 days made it feel very real. My skin feels less dry too.
Using the Second Showerhead
Before
After 40 daysI showed my roommate the old filter because it looked nasty. She literally bought one the same night.
Using the Second Showerhead
Before
After 7 daysWe got it for our baby's bath, but I ended up noticing it too. My skin doesn't feel as dried out after showers.
Using the Second Showerhead
The Science
Most filters fade in weeks.
Ours doesn't.
Carbon and KDF filters trap chlorine until they fill up, then they stop. Vitamin C neutralizes it through a chemical reaction that doesn't degrade through the filter's life.
* Micron sediment filter certified to NSF/ANSI 42 standards.
NSF Certified
Sediment FIlter*
Traps rust, sediment
& particles down to
5 µm - finer than a
white blood cell.
Vitamin C Core
Neutralizes 99.9% of
chlorine & chloramine
on contact - from your
first shower to your last.
The Science
Proof you can measure.
NSF/ANSI 42 certified filter media, independently lab-verified at 99.9% chlorine removal. Third-party proven, not self-declared.
Independent lab testing measured 99.9%+ free chlorine removal. That’s the chlorine you’d otherwise breathe in and absorb through your skin.
Carbon filters saturate and fade. Our Vitamin C media neutralizes chlorine chemically, holding its removal rate steadily through the filter’s life.
*Micron PP sediment filter certified to NSF/ANSI 42 standards. 99.9% chlorine removal via Vitamin C, tested independently.
The Comparison
How Second Shower
Compares.
|
Our Pick
Second Shower |
KDF / Carbon Filters | |
|---|---|---|
| Clinically tested & NSF/ANSI 42 certified*PP sediment filter | ||
| Consistent performance over full lifespanNo degradation at Day 60 | ||
| Removes 99.9% of chlorine | ||
| Infuses vitamins into water | ||
| Transparent filter with Truth Window | ||
| Maintains water pressure176 precision micro-jets | ||
| Works with any standard shower arm |
*PP sediment filter certified to NSF/ANSI 42 standards. Chlorine removal claims based on independent laboratory testing of Vitamin C filtration.
The Journey
Benefits that build over time
Here's what to expect with daily use of your Second Shower filter.
See Clinical Data →Instant chlorine removal
From your very first shower, 99.9% of chlorine is neutralized. You'll feel the difference in water softness immediately.
Skin feels calmer, less tight
Without daily chlorine exposure, your skin's natural moisture barrier starts recovering. Less dryness after showering.
Visible hair and scalp improvement
Hair retains more natural oils. Reduced breakage, less frizz, and color-treated hair stays vibrant longer.
Full skin and hair transformation
Your skincare products work better. Hair is noticeably stronger. The difference is clear — and so is your filter's Truth Window.
Getting Started
Three steps. Sixty seconds.
Remove
Unscrew your old showerhead, counter-clockwise. No tools.
Attach
Hand-tighten the Second Shower on. A leak-free seal in about 60 seconds.
Replace
When your filter's due, twist the chamber, swap the cartridge, and you're back to fresh.
Subscribe & Save
Clean water, delivered.
Your First Order
The Welcome Kit
Everything you need to get started: showerhead, first filter, and installation guide.
Sustainable Refills
Fresh filters, on schedule
2-pack filters delivered every 2 months. Cancel or pause anytime.
2-pack filters
2-pack filters
Questions?
We're here to help.
How is this different from a basic shower filter?
Most shower filters use carbon (KDF), which loses effectiveness within weeks and can't guarantee 99.9% chlorine removal across the filter's life. Second Shower uses food-grade Vitamin C — the same ascorbic acid hospitals use for dechlorination. It neutralizes chlorine through a direct chemical reaction, so removal stays at 99.9% from Day 1 to Day 120. Our PP sediment filter is also independently certified to NSF/ANSI 42 standards — that costs $15,000–$30,000 and takes 6–12 months. Most brands skip it. We didn't.
Will it lower my water pressure?
No. 176 precision micro-jets distribute the flow evenly across the spray face, so you get full coverage at standard residential pressure. Most customers actually describe it as feeling stronger because the stream is more focused. If you're in a low-pressure home, the spray geometry is designed to compensate — no booster needed.
How long does the filter last?
Every 2–4 months for the wall-mount Showerhead. You don't have to guess — the Truth Window shows you exactly when. The filter darkens as it captures sediment and metals, and the white Vitamin C powder in the lower chamber clears as it depletes. Subscribe and we deliver a 2-pack every 120 days for $36 (vs $39 one-time). Skip, pause, or cancel anytime.
Will it fit my shower?
Yes. It threads onto any standard 1/2" NPT shower arm — that's 99% of showers in the US. No tools, no adapters, no plumber. Installation takes about 60 seconds: unscrew your old head, wrap the included plumber's tape, hand-tighten the new one. If your setup is unusual, send a photo of your shower arm to hello@secondshower.us and we'll confirm before you buy.
What does NSF/ANSI 42 certified mean?
Our filter has two stages. The PP sediment filter is independently certified to NSF/ANSI 42 — a third-party standard for particulate reduction and material safety. The Vitamin C gel matrix handles the 99.9% chlorine removal, tested independently at real shower conditions. Two different mechanisms, both verified by labs that aren't us.
What is the Truth Window — what am I supposed to see?
It's a transparent chamber built into the filter housing. You watch filtration happen in real time: sediment, rust, and heavy metal particles collect in the upper chamber as your water passes through, and the white Vitamin C powder gradually clears as it neutralizes chlorine. No marketing claims required. You see exactly what was in your water — and what isn't anymore.
My skin felt drier in the first few days. Is something wrong?
No — this is normal, and it's actually a good sign. Chlorinated water leaves a slippery residue that mimics "moisture." When we strip the chlorine out, your skin feels its actual cleaner state for the first time, which can read as tighter at first. Most people adjust within 2 weeks. Tips: use slightly cooler water, apply a light moisturizer after showering, and use about 30% less shampoo (it lathers more without chlorine interference).
What if it doesn't work for me?
30-day returns, no questions asked. Every device is also covered by a lifetime warranty against manufacturing defects. We'd rather refund a filter you don't love than keep a customer who isn't seeing results — that's why the Truth Window exists in the first place. Free shipping $40 or more, ships within 1 business day.
One filter. One look. You'll know.
The truth window shows you what's been in your water. That's all it takes.
Shop now