---
title: "Under Sink Water Filter — £196K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/diy-tools/under-sink-water-filter"
last_updated: "2026-07-31T08:42:54.083Z"
locale: en
meta:
description: "Niche score 38/100 · £196K/yr market · 143K searches/yr · £56.64 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 38/100 · £196K/yr market · 143K searches/yr · £56.64 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Under Sink Water Filter — £196K/yr Amazon UK Niche (2026) - Flapen"
---
# **under sink water filter**
**Skip it**
Brand-locked demand (top 5 brands take 95% of clicks) — this niche doesn't clear our bar today.
Market size 39Growth 24Conversion 30Competition 20Returns 78Price range 71Avg price 91Brand share 11Review moat 25Quality gap 48
**Avg price**
**Great****£56.64**
avg listing price — sweet spot $15–$100
**Returns**
**Great****1.8%**
return rate — above 5% kills the launch gate
**Price range**
**Good****£10.68–£130.58**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Market size**
**Okay****£196K**
£196K/yr · 143K searches
**Conversion**
**Okay****2.4%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Bad****4,558.08**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Bad****-2.1%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****77%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****95%**
top-5 brand share — brand-locked demand
**Signals**[** High Price**](https://flapen.com/research/niches?market=uk&signal=high_price "Avg price > $50")
According to Flapen's Amazon United Kingdom niche tracking, under sink water filter is a £196K/yr Amazon United Kingdom market (143K searches/yr). The top 5 brands hold 95% of demand. Demand peaks in Jul–Nov. Verdict: Skip it — 38/100.
Data updated Jul 22, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **under sink water filter market data**
- **Units sold / yr**
- **3K–3K**
- avg 100–250/product
- **Revenue / yr**
- **£142K–£170K**
- units × avg price
- **Conversion rate**
- **2.4%**
- **Avg BSR**
- **#9**
- **Page quality**
- **0%**
- **Prime**
- **92%**
- **Sponsored**
- **75%**
- **Out of stock**
- **1.5%**
- **Avg brand age**
- **62 months**
- **Avg seller age**
- **174 days**
## **Competition & brand share**
The top 5 products capture 77% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**7 **▼falling
**Sellers**
**14**
**Top-5 brand share**
**95%**
Top 20: 100%
**Top-5 click share**
**77%**
Top 20: 100%
**Open market**
**2%**
- Waterdrop73% - Water210% - AQUA CREST6% - Finest-Filters4% - Finerfilters3% - GOLDEN ICEPURE3% - Open — no brand owns it (1 brand, 2%)
## **Demand & seasonality**
Weekly Amazon search volume, last 103 weeks — -2.1% search growth over the last 90 days.
9K7KSpike '24Holiday '24Prime Day '25Spike '25Black Friday '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jul, Nov · busiest ÷ quietest = 2.0×
[**Open Trend **](https://flapen.com/research/uk/diy-tools/under-sink-water-filter/trend)
## **Top under sink water filter search terms**
- **under sink water filter**52K/yr+2.9%1.2% conv. - **inline water filter**17K/yr+4.2%1.3% conv. - **under sink water filters**12K/yr-26.0%1.1% conv. - **water filter under sink**12K/yr-0.6%1.0% conv. - **undersink water filter system**8K/yr+10.8%1.2% conv. - **under sink water filter system**9K/yr-6.7%1.0% conv. - **in line water filter**5K/yr+0.6%1.6% conv. - **under sink filter**5K/yr-3.2%1.0% conv. - **under-sink filters**5K/yr-5.9%0.9% conv. - **waterdrop under sink filter**3K/yr+6.1%4.1% conv. [**All search terms **](https://flapen.com/research/uk/diy-tools/under-sink-water-filter/search-terms)
## **Top under sink water filter 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%10%£20K20%£39K30%£59K40%£78K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 12 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Waterdrop 10UA Under Sink Water Filter 11000 gallons High Capacity Water Filter System NSF/ANSI 42 Certified Reduce PFAS PFOA/PFOS Reduce Lead Chlorine Bad Taste Odor**Waterdrop**£49.13**4.5★12,980 rev](https://www.amazon.co.uk/dp/B083NPW1DN) [2**Waterdrop TSA Under Sink Water Filter System 3-Stage High Capacity Water Filtration System NSF/ANSI 42 Certified Reduce PFAS PFOA/PFOS Reduce Lead Chlorine Bad Taste**Waterdrop**£90.48**4.4★6,601 rev](https://www.amazon.co.uk/dp/B08P58F9SG) [3**Water2 Pod 2.0 Under Sink Filter - Reduces Contaminants for Filtered Better-Tasting Water. Quick & Easy to Install. Backed by Bear Grylls. Kit - Includes Capsule Flexis Smart Buzzer & Guide.**Water2**£102.17**4.5★301 rev](https://www.amazon.co.uk/dp/B0F7VHCVVC) [4**Waterdrop 10UA PRO Under Sink Water Filter No Drilling Required Time Reminder Easy Installation Reduces Lead Chlorine Bad Taste & Odor NSF/ANSI 42 Certified 11000 Gallons Does not Lower TDS**Waterdrop**£52.22**4.5★155 rev](https://www.amazon.co.uk/dp/B0FB94G6M1) [5**Waterdrop 10UA-UF 0.01 m Ultra Filtration Under Sink Water Filter for Baçtria Reduction 30 000 Liters Chlorine Reduction Capacity Direct Connect to Kitchen Faucet Reduce PFAS PFOA/PFOS**Waterdrop**£56.99**4.4★2,807 rev](https://www.amazon.co.uk/dp/B085G1D2TW)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Waterdrop 10UA PRO Under Sink Water Filter No Drilling Required Time Reminder Easy Installation Reduces Lead Chlorine Bad Taste & Odor NSF/ANSI 42 Certified 11000 Gallons Does not Lower TDS**Waterdrop**£52.22**155 rev1y ago](https://www.amazon.co.uk/dp/B0FB94G6M1) [**Water2 Pod 2.0 Under Sink Filter - Reduces Contaminants for Filtered Better-Tasting Water. Quick & Easy to Install. Backed by Bear Grylls. Kit - Includes Capsule Flexis Smart Buzzer & Guide.**Water2**£102.17**301 rev1y ago](https://www.amazon.co.uk/dp/B0F7VHCVVC) [**Ibergrif Undersink Water Filter System NSF/ANSI 42 Certified Reduces Chlorine Lead Fluoride Bad Taste and Odor Quick Installation Black-M91009**Ibergrif**£30.99**306 rev2y ago](https://www.amazon.co.uk/dp/B0CMPRMR83) [**Under Sink Water Filter System High Capacity 80 000 Litres Undersink Drinking Water Filtration System Reduce Heavy Metals Chlorine Bad Taste Odours**Finest-Filters**£49.24**89 rev2y ago](https://www.amazon.co.uk/dp/B0CZ7BMS78) [**Waterdrop TSA Under Sink Water Filter System 3-Stage High Capacity Water Filtration System NSF/ANSI 42 Certified Reduce PFAS PFOA/PFOS Reduce Lead Chlorine Bad Taste**Waterdrop**£90.48**6,601 rev5y ago](https://www.amazon.co.uk/dp/B08P58F9SG)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Ibergrif Undersink Water Filter System NSF/ANSI 42 Certified Reduces Chlorine Lead Fluoride Bad Taste and Odor Quick Installation Black-M91009**Ibergrif**£30.99**4.3★**▲ 78%**](https://www.amazon.co.uk/dp/B0CMPRMR83) [**GOLDEN ICEPURE 2 Pieces Refrigerator Water Filter Compatible with Samsung DA29-10105J DA29-10105J HAFEX/EXP DA99-02131B WSF-100 EF9603 HAIER LG Inline Refrigerator**GOLDEN ICEPURE**£10.68**4.6★**▲ 49%**](https://www.amazon.co.uk/dp/B07DCRN38R) [**Waterdrop 10UA PRO Under Sink Water Filter No Drilling Required Time Reminder Easy Installation Reduces Lead Chlorine Bad Taste & Odor NSF/ANSI 42 Certified 11000 Gallons Does not Lower TDS**Waterdrop**£52.22**4.5★**▲ 49%**](https://www.amazon.co.uk/dp/B0FB94G6M1) [**Waterdrop TSU 0.01m Ultra-Filtration Under Sink Water Filter System 3-Stage High Capacity USA Tech Smart Panel No Waste Water 2 Years Lifetime**Waterdrop**£130.58**4.4★**▲ 33%**](https://www.amazon.co.uk/dp/B086YH42QP) [**Waterdrop 10UA Under Sink Water Filter 11000 gallons High Capacity Water Filter System NSF/ANSI 42 Certified Reduce PFAS PFOA/PFOS Reduce Lead Chlorine Bad Taste Odor**Waterdrop**£49.13**4.5★**— 9%**](https://www.amazon.co.uk/dp/B083NPW1DN)
**~~View all trending →~~**
## **What buyers say about under sink water filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**21%
*“Great water filter”*
**Assembly/Installation**17%
*“Easy install”*
**Quality-Overall**13%
*“Excellent product”*
**Size-Overall**13%
*“Easy fit”*
**Value For Money**8%
*“reasonable price”*
**Advertised Vs Actual Product**5%
*“AS DESCRIBED”*
**Ease Of Use**4%
*“very user friendly”*
**Efficiency**3%
*“Does whatnot says - water much improved”*
**Leak-Proof**2%
*“Great filter, does the job no leaks”*
**Compatibility-Overall**1%
*“vise versa so it was compatable”*
### **What buyers complain about **
**Filtration**20%
*“Was a little sceptical with these type of filters”*
**Value For Money**6%
*“can be expensive”*
**Assembly/Installation**6%
*“Installation was abit of pain”*
**Size-Overall**5%
*“It was a bit fiddly to fit”*
**Connectivity-Overall**5%
*“found it impossible to disconnect”*
**Ease Of Use**4%
*“And of No use”*
**Leak-Proof**4%
*“Unable to use and both leaked”*
**Water Resistance**4%
*“It doesn't purify the water”*
**Pressure**4%
*“Im not the only person experiencing this issue with the water pressure or the lack of response”*
**Storage Capacity**3%
*“Didnt have a great deal of space -”*
### **Top return reasons **
**Size-Overall**32%
**Compatibility-Overall**21%
**Filtration**13%
**Leak-Proof**7%
**Assembly/Installation**6%
**Connectivity-Overall**5%
**Functionality-Overall**3%
**Quality-Overall**2%
**Value For Money**1%
**Advertised Vs Actual Product**1%
## **Common questions**
- **Is under sink water filter profitable to sell on Amazon United Kingdom?**
- The niche generates £196K/yr across 12 tracked products. 90-day search growth is -2.1%. Flapen's verdict: Skip it (38/100).
- **How competitive is the under sink water filter niche?**
- 7 brands and 14 sellers compete. The top 5 products take 77% of clicks and top 5 brands hold 95% of demand.
- **What do buyers complain about in under sink water filter?**
- Top complaints mined from reviews: Filtration, Value For Money, Assembly/Installation. The return rate is 1.8%.
- **When does demand for under sink water filter peak?**
- Demand peaks in Jul–Nov; the busiest month runs 2.0× the quietest.
- **What does it cost to enter the under sink water filter niche?**
- Listings span £10.68–£130.58; the average listing price is £56.64 (sweet spot $15–$100). The average incumbent carries 4,558 reviews — the moat a new listing must climb.
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