---
title: "Sponge Filter — £49K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/pet-supplies/sponge-filter"
last_updated: "2026-07-31T10:05:57.981Z"
locale: en
meta:
description: "Niche score 48/100 · £49K/yr market · 142K searches/yr · £11.22 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · £49K/yr market · 142K searches/yr · £11.22 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Sponge Filter — £49K/yr Amazon UK Niche (2026) - Flapen"
---
# **sponge filter**
**Skip it**
A small market ($49K/yr) — this niche doesn't clear our bar today.
Market size 12Growth 19Conversion 39Competition 78Returns 79Price range 46Avg price 44Brand share 39Review moat 80Quality gap 80
**Quality gap**
**Great****4.2★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Great****402.83**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Great****1.8%**
return rate — above 5% kills the launch gate
**Competition**
**Great****37%**
top-5 click share — an open shelf
**Price range**
**Okay****£3.39–£24.88**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Okay****£11.22**
avg listing price — sweet spot $15–$100
**Conversion**
**Okay****3.1%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Okay****82%**
top-5 brand share — brands hold most of the demand
**Growth**
**Bad****-12.5%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****£49K**
£49K/yr · 142K searches
According to Flapen's Amazon United Kingdom niche tracking, sponge filter is a £49K/yr Amazon United Kingdom market (142K searches/yr). The top 5 brands hold 82% of demand. Verdict: Skip it — 48/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **sponge filter market data**
- **Units sold / yr**
- **4K–5K**
- avg 100–250/product
- **Revenue / yr**
- **£45K–£56K**
- units × avg price
- **Conversion rate**
- **3.1%**
- **Avg BSR**
- **#72**
- **Page quality**
- **0%**
- **Prime**
- **95%**
- **Sponsored**
- **90%**
- **Out of stock**
- **2.4%**
- **Avg brand age**
- **41 months**
- **Avg seller age**
- **214 days**
## **Competition & brand share**
Clicks spread well past the top 5 (37% combined) — an open shelf where new products get seen.
**Brands**
**13 **▼falling
**Sellers**
**18**
**Top-5 brand share**
**82%**
Top 20: 100%
**Top-5 click share**
**37%**
Top 20: 77%
**Open market**
**12%**
- Pawfly34% - Powkoo21% - AQQA11% - hygger8% - VILLNO8% - BEGONDIS6% - Open — no brand owns it (7 brands, 12%)
## **Demand**
Weekly Amazon search volume, last 18 weeks — -12.5% search growth over the last 90 days.
3K2KMar '26Apr '26May '26May '26Jun '26Jul '26
[**Open Trend **](https://flapen.com/research/uk/pet-supplies/sponge-filter/trend)
## **Top sponge filter search terms**
- **sponge filter**46K/yr-5.4%2.5% conv. - **sponge filters for aquarium**46K/yr-19.6%2.9% conv. - **aquarium sponge filter**18K/yr-18.4%2.6% conv. - **sponge filter and air pump**7K/yr-0.1%1.4% conv. - **fish tank sponge filter**8K/yr-19.0%2.7% conv. - **sponge filters**5K/yr-2.5%1.3% conv. - **small sponge filter**5K/yr-11.6%4.2% conv. - **sponge filter for fish tank**4K/yr+24.1%2.3% conv. - **sponge fish tank filter**4K/yr-28.6%1.5% conv. [**All search terms **](https://flapen.com/research/uk/pet-supplies/sponge-filter/search-terms)
## **Top sponge 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%3%£1K6%£3K9%£4K12%£6K101001K10K 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**Pawfly Aquarium Nano Bio Sponge Filter Quiet Betta Fry Shrimp and Small Fish Foam Filter with Tubing Suction Cup Check Valve Connector and Control Valve Accessories for Tiny Fish Tank up to 40 Litre**Pawfly**£6.69**4.4★791 rev](https://www.amazon.co.uk/dp/B09V51NMY9) [2**Powkoo Sponge Filters for Aquarium Fish Tank Air Filter Aquarium Sponge Filter for Shrimp Betta Breeding Tank Large Up to 300L (L)**Powkoo**£8.26**4.6★871 rev](https://www.amazon.co.uk/dp/B01KRGMU36) [3**Powkoo Corner Sponge Filters for Aquarium Shrimp Nano Breeding Fish Tank Up to 200 Litre Tank (90063-L)**Powkoo**£7.20**4.4★151 rev](https://www.amazon.co.uk/dp/B078TFMHX4) [4**Pawfly Aquarium Bio Sponge Filter Quiet Betta Fry Shrimp and Small Fish Foam Filter for Fish Tanks up to 80 Litre3 Pack**Pawfly**£9.11**4.6★446 rev](https://www.amazon.co.uk/dp/B0B2JRPGCW) [5**VILLNO Air Powered Aquarium Sponge Filter with Biochemical Sponge and Ceramic Balls Quiet Submersible Fish Tank Filter for 30-120L Fresh Water and Saltwater**VILLNO**£9.69**4.2★54 rev](https://www.amazon.co.uk/dp/B0F38CMBWD)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Anxihanee Sponge filter for Aquarium Fish Tank Internal Filter for Shrimp Betta Breeding Nano Tank up to 300 Litre (60PPI)**Anxihanee**£8.27**20 rev1y ago](https://www.amazon.co.uk/dp/B0FC5T11XF) [**BEGONDIS Aquarium Sponge Filter Bio-Filtration System for Fish Tank Betta Tank & Breeding Aquariums Gentle Flow for Fry Shrimp & Sensitive Species (20-40L)**BEGONDIS**£6.04**61 rev1y ago](https://www.amazon.co.uk/dp/B0F9Y9MZL2) [**BEGONDIS Aquarium Sponge Filter Bio-Filtration System for Fish Tank Betta Tank & Breeding Aquariums Gentle Flow for Fry Shrimp & Sensitive Species (40-80L)**BEGONDIS**£6.00**61 rev1y ago](https://www.amazon.co.uk/dp/B0F9Y9K3XJ) [**VILLNO Air Powered Aquarium Sponge Filter with Biochemical Sponge and Ceramic Balls Quiet Submersible Fish Tank Filter for 30-120L Fresh Water and Saltwater**VILLNO**£9.69**54 rev1y ago](https://www.amazon.co.uk/dp/B0F38CMBWD) [**VILLNO Air Powered Aquarium Sponge Filter with Biochemical Sponge and Ceramic Balls Quiet Submersible Fish Tank Filter for 50-200L Fresh Water and Saltwater**VILLNO**£11.83**54 rev1y ago](https://www.amazon.co.uk/dp/B0F38C5M9N)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**VILLNO Air Powered Aquarium Sponge Filter with Biochemical Sponge and Ceramic Balls Quiet Submersible Fish Tank Filter for 30-120L Fresh Water and Saltwater**VILLNO**£9.69**4.2★**▲ 163%**](https://www.amazon.co.uk/dp/B0F38CMBWD) [**VILLNO Air Powered Aquarium Sponge Filter with Biochemical Sponge and Ceramic Balls Quiet Submersible Fish Tank Filter for 50-200L Fresh Water and Saltwater**VILLNO**£11.83**4.2★**▲ 88%**](https://www.amazon.co.uk/dp/B0F38C5M9N) [**Anxihanee Sponge filter for Aquarium Fish Tank Internal Filter for Shrimp Betta Breeding Nano Tank up to 300 Litre (60PPI)**Anxihanee**£8.27**4.8★**▲ 82%**](https://www.amazon.co.uk/dp/B0FC5T11XF) [**Pawfly Aquarium Air Pump 2.5 L/min Quiet Oxygen Aerator Pump with Air Stone sponge filter Airline Tubing and Check Valve Accessories for 10-40 L Buckets and Fish Tanks**Pawfly**£11.63**4.0★**▲ 62%**](https://www.amazon.co.uk/dp/B09NDKDXXL) [**Pawfly Large Aquarium Bio Sponge Filter Quiet Betta Fry Shrimp and Small Fish Foam Filter for Fish Tank up to 200 Litre**Pawfly**£7.57**4.5★**▲ 54%**](https://www.amazon.co.uk/dp/B09H6KCNK3)
**~~View all trending →~~**
## **What buyers say about sponge filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**35%
*“Filter works well”*
**Value For Money**11%
*“Good price”*
**Quality-Overall**10%
*“Quality item with good easy to make pieces”*
**Ease Of Cleaning**8%
*“It cleans my tank much better than the one I had before”*
**Advertised Vs Actual Product**5%
*“Did the job”*
**Size-Overall**5%
*“Good size”*
**Ease Of Use**3%
*“Easy to use”*
**Water Flow**3%
*“allow lots of water to flow through”*
**Spray/Flow**3%
*“it allows me to direct the flow exactly where I need it”*
**Strength**1%
*“It also feels quite sturdy for the price”*
### **What buyers complain about **
**Durability**17%
*“Breaks after a month”*
**Filtration**16%
*“foats had to squeeze it between the filter”*
**Size-Overall**15%
*“Absolutely tiny”*
**Quality-Overall**6%
*“Not the best”*
**Functionality-Overall**6%
*“Dont work”*
**Advertised Vs Actual Product**4%
*“Not as advertised”*
**Value For Money**3%
*“It does the job intended what more can be said a little expensive for what it is”*
**Ease Of Use**3%
*“can be a bit tricky to get it to stay in one place”*
**Design-Overall**3%
*“Not best design to be honest”*
**Thickness**2%
*“Too thin”*
### **Top return reasons **
**Size-Overall**48%
**Filtration**10%
**Functionality-Overall**10%
**Defective Material/Parts**6%
**Compatibility-Overall**5%
**Advertised Vs Actual Product**4%
**Durability**4%
**Quality-Overall**2%
**Water Resistance**1%
**Instructions/User Manual/Troubleshooting**1%
## **Common questions**
- **Is sponge filter profitable to sell on Amazon United Kingdom?**
- The niche generates £49K/yr across 40 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is -12.5%. Flapen's verdict: Skip it (48/100).
- **How competitive is the sponge filter niche?**
- 13 brands and 18 sellers compete. The top 5 products take 37% of clicks and top 5 brands hold 82% of demand.
- **What do buyers complain about in sponge filter?**
- Top complaints mined from reviews: Durability, Filtration, Size-Overall. The return rate is 1.8%.
- **What does it cost to enter the sponge filter niche?**
- Listings span £3.39–£24.88; the average listing price is £11.22 (sweet spot $15–$100). The average incumbent carries 403 reviews — the moat a new listing must climb.
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