---
title: "Replacement Under-sink Water Filters — $141K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/replacement-under-sink-water-filters"
last_updated: "2026-08-05T23:54:20.658Z"
locale: en
meta:
description: "Niche score 52/100 · $141K/yr market · 74K searches/yr · $26.09 avg price. Strong incumbent ratings (4.7★) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 52/100 · $141K/yr market · 74K searches/yr · $26.09 avg price. Strong incumbent ratings (4.7★) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Replacement Under-sink Water Filters — $141K/yr Amazon US Niche (2026) - Flapen"
---
# **replacement under-sink water filters**
**Worth a look**
Shows low returns (0.9%), but strong incumbent ratings (4.7★) keeps it on the watch list.
Market size 31Growth 36Conversion 76Competition 48Returns 95Price range 83Avg price 95Brand share 45Review moat 38Quality gap 20
**Returns**
**Incredible****0.9%**
return rate — above 5% kills the launch gate
**Avg price**
**Incredible****$26.09**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$6.12–$64.79**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Great****7.3%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Okay****56%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****78%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Okay****2,689.32**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Okay****+8.6%**
90-day search growth — must beat 0% to launch
**Market size**
**Okay****$141K**
$141K/yr · 74K searches
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, replacement under-sink water filters is a $141K/yr Amazon United States market (74K searches/yr). The top 5 brands hold 78% of demand. Verdict: Worth a look — 52/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **replacement under-sink water filters market data**
- **Units sold / yr**
- **4K–5K**
- avg 100–250/product
- **Revenue / yr**
- **$104K–$130K**
- units × avg price
- **Conversion rate**
- **7.3%**
- **Avg BSR**
- **#87**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **96%**
- **Out of stock**
- **3.1%**
- **Avg brand age**
- **81 months**
- **Avg seller age**
- **143 days**
## **Competition & brand share**
The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**16 **▲rising
**Sellers**
**52**
**Top-5 brand share**
**78%**
Top 20: 100%
**Top-5 click share**
**56%**
Top 20: 92%
**Open market**
**17%**
- Aquaboon26% - PUREPLUS23% - ICEPURE17% - AquaWeaver6% - Membrane Solutions5% - BLUERISE5% - Open — no brand owns it (10 brands, 17%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +8.6% search growth over the last 90 days.
2K1KPrime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/replacement-under-sink-water-filters/trend)
## **Top replacement under-sink water filters search terms**
- **replacement under-sink water filters**13K/yr-10.8%0.3% conv. - **10x2.5 water filter**9K/yr+23.8%5.7% conv. - **house water filter replacement**5K/yr+112.8%5.6% conv. - **10 water filter**7K/yr+11.2%4.7% conv. - **5 micron filter**7K/yr-8.1%2.6% conv. - **2.5 x 10 water filter**6K/yr+0.7%4.6% conv. - **10 inch water filter**7K/yr+7.2%4.2% conv. - **water filter cartridge 10 inch**4K/yr+34.1%4.0% conv. - **10 inch water filter cartridge**4K/yr+20.6%3.3% conv. - **water filter 10 x 2.5**3K/yr-4.1%6.5% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/replacement-under-sink-water-filters/search-terms)
## **Top replacement under-sink water filters products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%5%$7K10%$14K15%$21K20%$28K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Aquaboon 5 Micron 10 x 2.5 Sediment Filter - Whole House Water Filter Replacement Compatible with Well Water Filters - P5 AP110 WHKF-GD05 6 Pack**Aquaboon**$23.32**4.7★5,541 rev](https://www.amazon.com/dp/B01M01EDHK) [2**ICEPURE 1 Micron 2.5 x 10 Whole House CTO Carbon Sediment Water Filter Cartridge Compatible with DuPont WFPFC8002 WFPFC9001 SCWH-5 WHCF-WHWC WHCF-WHWC FXWTC CBC-10 RO Unit Pack of 4**ICEPURE**$26.77**4.6★6,299 rev](https://www.amazon.com/dp/B084DPJW37) [3**1 Micron 2.5 x 10 Whole House CTO Carbon Water Filter Cartridge Replacement for Under Sink Water Filter System Dupont WFPFC8002 WFPFC9001 FXWTC SCWH-5 WHEF-WHWC WHCF-WHWC AMZN-SCWH-5 4Pack**PUREPLUS**$26.90**4.6★7,698 rev](https://www.amazon.com/dp/B01N1IJ5V1) [4**PUREPLUS 5 Micron 10 x 4.5 Whole House Sediment and Carbon Water Filter Replacement Cartridge for GE FXHTC GXWH40L GXWH35F GNWH38S Culligan RFC-BBSA WRC25HD PP10BB-CC Pentek RFC-BB 2Pack**PUREPLUS**$28.80**4.7★7,836 rev](https://www.amazon.com/dp/B01N2H2OO6) [5**AquaWeaver 5 Micron Sediment Water Filter Cartridge 10 x 2.5 Whole House Filter Replacement Compatible with All Standard 10-Inch RO and Well Water Filter Systems HF-150A WH-S200-C AP11T 6 Pack**AquaWeaver**$21.56**4.8★90 rev](https://www.amazon.com/dp/B0G3XT7J6T)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**AquaWeaver 5 Micron Sediment Water Filter Cartridge 10 x 2.5 Whole House Filter Replacement Compatible with All Standard 10-Inch RO and Well Water Filter Systems HF-150A WH-S200-C AP11T 6 Pack**AquaWeaver**$21.56**90 rev8mo ago](https://www.amazon.com/dp/B0G3XT7J6T) [**5 Micron 10 x 4.5 Whole House Water Filter Compatible with GE FXHSC**Caehomly**$36.71**88 rev10mo ago](https://www.amazon.com/dp/B0FQNR79CV) [**Whirlpool 10 x 2.5 Carbon Block Water Filter WHKF-WHCB NSF Certified 5 Micron Reduces Chlorine and Sediment 6-Month Life CTO Replacement Cartridge Fits Home Filter Housing Reverse Osmosis System**Whirlpool**$11.89**56 rev10mo ago](https://www.amazon.com/dp/B0FPNZVP5J) [**20 Micron 10 x 2.5 Pleated Sediment Well Water Filter Cartridge 6 Pack**Locofiltr**$33.45**116 rev2y ago](https://www.amazon.com/dp/B0CYSZ1CMZ) [**BLUERISE 5 Micron 10 x 2.5 Sediment Water Filter Replacement Cartridge**BLUERISE**$19.91**211 rev3y ago](https://www.amazon.com/dp/B0D25L3WRZ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Whirlpool 10 x 2.5 Carbon Block Water Filter WHKF-WHCB NSF Certified 5 Micron Reduces Chlorine and Sediment 6-Month Life CTO Replacement Cartridge Fits Home Filter Housing Reverse Osmosis System**Whirlpool**$11.89**4.6★**▲ 116%**](https://www.amazon.com/dp/B0FPNZVP5J) [**5 Micron 10 x 4.5 Whole House Water Filter Compatible with GE FXHSC**Caehomly**$36.71**4.7★**▲ 113%**](https://www.amazon.com/dp/B0FQNR79CV) [**AquaWeaver 5 Micron Sediment Water Filter Cartridge 10 x 2.5 Whole House Filter Replacement Compatible with All Standard 10-Inch RO and Well Water Filter Systems HF-150A WH-S200-C AP11T 6 Pack**AquaWeaver**$21.56**4.8★**▲ 105%**](https://www.amazon.com/dp/B0G3XT7J6T) [**20 Micron 10 x 2.5 Pleated Sediment Well Water Filter Cartridge 6 Pack**Locofiltr**$33.45**4.6★**▲ 37%**](https://www.amazon.com/dp/B0CYSZ1CMZ) [**PUREPLUS 5 Micron 10 x 4.5 Whole House String Wound Sediment Filter for Well Water Replacement Cartridge for 84637 WPX5BB97P PC10 355214-45 355215-45 WP10BB97P WP5BB97P 2Pack**PUREPLUS**$29.22**4.8★**▲ 22%**](https://www.amazon.com/dp/B01N9024NF)
**~~View all trending →~~**
## **What buyers say about replacement under-sink water filters**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**32%
*“Excellent Filter”*
**Value For Money**17%
*“Decent price”*
**Size-Overall**12%
*“Fit perfect”*
**Quality-Overall**11%
*“Excellent product”*
**Advertised Vs Actual Product**8%
*“As advertised”*
**Efficiency**3%
*“Does the job”*
**Assembly/Installation**3%
*“Easy to install”*
**Smell**2%
*“No odors, great value”*
**Durability**1%
*“are durable”*
**Water Resistance**1%
*“Keeps water clean and clear”*
### **What buyers complain about **
**Filtration**23%
*“Worst filters Ive purchased”*
**Size-Overall**11%
*“some of them were noticeably too short”*
**Quality-Overall**7%
*“Aquaboon filters are poorly made”*
**Water Resistance**7%
*“Filters didnt allow water threw”*
**Durability**6%
*“Doesnt last”*
**Leak-Proof**4%
*“caused a leak”*
**Jamming/Clogging**3%
*“Clogged”*
**Compatibility-Overall**3%
*“Not compatible :”*
**Smell**3%
*“Says it reduces the chlorine smell and taste”*
**Value For Money**2%
*“Getting expensive”*
### **Top return reasons **
**Size-Overall**61%
**Filtration**17%
**Compatibility-Overall**13%
**Advertised Vs Actual Product**3%
**Value For Money**1%
**Leak-Proof**1%
**Functionality-Overall**1%
**Material Quality**1%
**Defective Material/Parts**0%
**Quality-Overall**0%
## **Common questions**
- **Is replacement under-sink water filters profitable to sell on Amazon United States?**
- The niche generates $141K/yr across 28 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is +8.6%. Flapen's verdict: Worth a look (52/100).
- **How competitive is the replacement under-sink water filters niche?**
- 16 brands and 52 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 78% of demand.
- **What do buyers complain about in replacement under-sink water filters?**
- Top complaints mined from reviews: Filtration, Size-Overall, Quality-Overall. The return rate is 0.9%.
- **When does demand for replacement under-sink water filters peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the replacement under-sink water filters niche?**
- Listings span $6.12–$64.79; the average listing price is $26.09 (sweet spot $15–$100). The average incumbent carries 2,689 reviews — the moat a new listing must climb.
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