Will it work with AQ-4100 model?

Yes. According to the Aquasana website, the AQ-4125 works as a filter replacement for the following models: AQ-4100, AQ-4100NSH and AQ-4105. I've got the AQ-4100 as well, so this is the replacement I'm ordering. It's $52.50 through Aquasana's website.

How often is it recommended to change filters?

I agree with 'Anonymous' (although the amt of people doesn't matter, it's just simply how many gallons flow through). It filters "10,000 gallons" An average 10 min shower uses 20 gals. Using this info it will last appr 500 showers. (adjust for your own personal usage). I have been using this shower filter exclusively for 15 yrs; I love it!! Would highly recommend.

will this filter help with hard well water (no clorine)?

Probably. I know that it filters out quite a bit, because the water where I live has quite a bit of of hardness and minerals. I get kidney stones from the shower water, and putting the filter on my shower has completely stopped my kidney stones. I have a handyman change the filter one month sooner than is recommended, just to make sure that I never have a problem again since I had 3 visits to the emergency room with stones and urinary tract infections. It was my handyman who recommended that I do this, tho my urologist thinks I am nuts. Hey, the skin is your largest organ and it takes in many things from the environment just like it gives off by-products from your body. Regardless, this filter works for me. My answer would be "yes" in response to your question.

Is there a reason the replacement filter costs more than the shower head with filter? Doesn't make sense to buy just the replacement.

probably because its much easier to replace just the filter vs. the entire showerhead but I'm not really sure

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Description

🚿 Elevate your daily ritual with pure, skin-loving shower water!

CERTIFIED CLEAN - NSF-tested filtration guarantees premium water quality every shower
DUAL STAGE PURITY - Advanced KDF-55D & coconut carbon combo targets harmful chemicals & VOCs
CHLORINE FREE GLOW - Eliminate 90%+ chlorine for visibly softer skin & hair in just 7 days
EFFORTLESS UPGRADE - No plumber needed—twist, remove, replace in seconds
BREATHE BETTER LIVE BETTER - Reduces chemical vapors in steam for healthier skin and respiratory wellness

The Aquasana AQ-4125 replacement cartridge uses a two-stage filtration system combining copper-zinc KDF-55D and coconut shell carbon to reduce over 90% of chlorine and harmful chemicals from shower water. Certified to NSF/ANSI Standard 177, it softens skin and hair by removing drying chlorine and VOCs, installs easily without tools, and fits Aquasana AQ-4100 and AQ-4105 models for a healthier, spa-like shower experience.

Specifications

Material	Plastic
Product Dimensions	2.76"D x 6.3"W x 2.76"H
Item Weight	1.6 Pounds
External Testing Certification	NSF
Product Benefits	Reduces chlorine for softer skin and healthier hair
Brand	Aquasana
UPC	890496000093
Global Trade Identification Number	00890496000093
Unit Count	1.00 Count
Compatible Water Purifier Models	Aquasana AQ-4100, Aquasana AQ-4105
Number of Items	1
Manufacturer	Aquasana
Part Number	AQ-4125
Item Weight	1.59 pounds
Item model number	AQ-4125
Is Discontinued By Manufacturer	Yes
Size	1-(Pack)
Color	White
Style	Cartridge
Pattern	Filter Cartridge
Item Package Quantity	1
Included Components	shower filter replacement cartridge
Batteries Included?	No
Batteries Required?	No
Warranty Description	180 Day Limited Warranty

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