sponge filter
Skip itA small market ($49K/yr) — this niche doesn't clear our bar today.
Quality gap
Great4.2★avg incumbent rating — lower means beatable quality
Review moat
Great402.83avg incumbent reviews — the moat a new listing must climb
Returns
Great1.8%return rate — above 5% kills the launch gate
Competition
Great37%top-5 click share — an open shelf
Price range
Okay£3.39–£24.88cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Okay£11.22avg listing price — sweet spot $15–$100
Conversion
Okay3.1%search→purchase rate — share of searches ending in a sale
Brand share
Okay82%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
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.Top sponge filter search terms
- sponge filter46K/yr
- sponge filters for aquarium46K/yr
- aquarium sponge filter18K/yr
- sponge filter and air pump7K/yr
- fish tank sponge filter8K/yr
- sponge filters5K/yr
- small sponge filter5K/yr
- sponge filter for fish tank4K/yr
- sponge fish tank filter4K/yr
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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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£6.694.4★791 rev
Powkoo Sponge Filters for Aquarium Fish Tank Air Filter Aquarium Sponge Filter for Shrimp Betta Breeding Tank Large Up to 300L (L)
Powkoo£8.264.6★871 rev
Powkoo Corner Sponge Filters for Aquarium Shrimp Nano Breeding Fish Tank Up to 200 Litre Tank (90063-L)
Powkoo£7.204.4★151 rev
Pawfly Aquarium Bio Sponge Filter Quiet Betta Fry Shrimp and Small Fish Foam Filter for Fish Tanks up to 80 Litre3 Pack
Pawfly£9.114.6★446 rev
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£9.694.2★54 rev
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£8.2720 rev
BEGONDIS Aquarium Sponge Filter Bio-Filtration System for Fish Tank Betta Tank & Breeding Aquariums Gentle Flow for Fry Shrimp & Sensitive Species (20-40L)
BEGONDIS£6.0461 rev
BEGONDIS Aquarium Sponge Filter Bio-Filtration System for Fish Tank Betta Tank & Breeding Aquariums Gentle Flow for Fry Shrimp & Sensitive Species (40-80L)
BEGONDIS£6.0061 rev
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£9.6954 rev
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£11.8354 rev
Trending
90-day click momentumVILLNO Air Powered Aquarium Sponge Filter with Biochemical Sponge and Ceramic Balls Quiet Submersible Fish Tank Filter for 30-120L Fresh Water and Saltwater
VILLNO£9.694.2★
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£11.834.2★
Anxihanee Sponge filter for Aquarium Fish Tank Internal Filter for Shrimp Betta Breeding Nano Tank up to 300 Litre (60PPI)
Anxihanee£8.274.8★
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£11.634.0★
Pawfly Large Aquarium Bio Sponge Filter Quiet Betta Fry Shrimp and Small Fish Foam Filter for Fish Tank up to 200 Litre
Pawfly£7.574.5★
What buyers say about sponge filter
What buyers praise and complain about, mined from review topics.What buyers love
“Filter works well”
“Good price”
“Quality item with good easy to make pieces”
“It cleans my tank much better than the one I had before”
“Did the job”
“Good size”
“Easy to use”
“allow lots of water to flow through”
“it allows me to direct the flow exactly where I need it”
“It also feels quite sturdy for the price”
What buyers complain about
“Breaks after a month”
“foats had to squeeze it between the filter”
“Absolutely tiny”
“Not the best”
“Dont work”
“Not as advertised”
“It does the job intended what more can be said a little expensive for what it is”
“can be a bit tricky to get it to stay in one place”
“Not best design to be honest”
“Too thin”
Top return reasons
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.