Is sponge filter profitable to sell on Amazon United States?

The niche generates $393K/yr across 43 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -7.6%. Flapen's verdict: Worth a look (50/100).

How competitive is the sponge filter niche?

9 brands and 15 sellers compete. The top 5 products take 38% of clicks and top 5 brands hold 90% of demand.

What do buyers complain about in sponge filter?

Top complaints mined from reviews: Size-Overall, Filtration, Durability. The return rate is 2.0%.

When does demand for sponge filter peak?

Demand is steady year-round — the busiest month runs 1.4× the quietest.

What does it cost to enter the sponge filter niche?

Listings span $5.92–$26.28; the average listing price is $13.40 (sweet spot $15–$100). The average incumbent carries 1,898 reviews — the moat a new listing must climb.

sponge filter

Worth a look

Shows a fragmented shelf (top 5 take 38% of clicks), but soft demand (-7.6% this quarter) keeps it on the watch list.

Competition

Great38%

top-5 click share — an open shelf

Returns

Great2.0%

return rate — above 6% kills the launch gate

Avg price

Good$13.40

avg listing price — sweet spot $15–$100

Market size

Good$393K

$393K/yr · 731K searches

Price range

Good$5.92–$26.28

cheapest to priciest tracked listing — scored on the share inside $15–$100

Conversion

Good4.0%

search→purchase rate — share of searches ending in a sale

Review moat

Okay1,897.81

avg incumbent reviews — the moat a new listing must climb

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Brand share

Bad90%

top-5 brand share — brand-locked demand

Growth

Bad-7.6%

90-day search growth — must beat 0% to launch

According to Flapen's Amazon United States niche tracking, sponge filter is a $393K/yr Amazon United States market (731K searches/yr). The top 5 brands hold 90% of demand. Verdict: Worth a look — 50/100.

Data updated Jul 17, 2026 · scored weekly · How we score niches

sponge filter market data

Units sold / yr: 30K–40K; avg 500–750/product
Revenue / yr: $402K–$536K; units × avg price
Launch success: —; 1 of 2 new (360d)
Conversion rate: 4.0%
Avg BSR: #114
Page quality: 0%
Prime: 100%
Sponsored: 91%
Out of stock: 0.0%
Avg brand age: 42 months
Avg seller age: 167 days

Competition & brand share

Clicks spread well past the top 5 (38% combined) — an open shelf where new products get seen.

Brands

9 falling

Sellers

Top-5 brand share

90%

Top 20: 100%

Top-5 click share

38%

Top 20: 79%

Open market

AQUANEAT42%
hygger16%
Pawfly14%
DVHEY11%
AQQA8%
ALEGI6%
Open — no brand owns it (3 brands, 4%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -7.6% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top sponge filter search terms

sponge filter406K/yr -12.0%3.3% conv.
aquarium sponge filter99K/yr -9.6%3.1% conv.
sponge filter 20+ gallon55K/yr +3.6%3.6% conv.
sponge filter 20 gallon28K/yr -12.6%4.2% conv.
fish tank sponge filter24K/yr -14.1%2.7% conv.
sponge filters20K/yr -5.8%2.9% conv.
sponge filter 40 gallon9K/yr +70.0%5.0% conv.
coarse sponge filter10K/yr +2.5%2.0% conv.
20 gallon sponge filter10K/yr -1.0%3.3% conv.
sponge filter 40+ gallon4K/yr +204.9%4.0% conv.

All 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 43 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

AQUANEAT 3 Pack Aquarium Bio Sponge Filter Breeding Fry Betta Shrimp Nano Fish Tank (Small up to 10Gal)

AQUANEAT$6.554.7★3,351 rev

Pawfly 3 Pack Aquarium Sponge Filter Quiet Betta Fry Shrimp and Small Fish Foam Filter for Tiny Fish Tank up to 10 Gallon

Pawfly$6.114.6★2,249 rev

AQUANEAT Aquarium Bio Sponge Filter Breeding Fry Betta Shrimp Nano Fish Tank (Large up to 60Gal)

AQUANEAT$8.984.7★9,197 rev

DVHEY 100-120 Gal Large Aquarium Sponge Filter with Air Stone and Ceramic Media 2 Pack Quiet Fish Tank Filters fit Breeding Fry Betta Shrimp Fish Tank

DVHEY$18.524.6★533 rev

hygger Aquarium Double Sponge Filter Comes with 2 Spare Sponges (S)

hygger$17.474.4★1,889 rev

Newest

by launch date

hygger Self-Sinking Sponge Filter for 330 Gallon Aquarium Air Powered Foam Filter for Freshwater & Saltwater Tanks Betta & Shrimp Safe

hygger$11.7927 rev

7mo ago

hygger Aquarium Double Sponge Filter: Upgraded Sponge Filter with Larger Filtration Area Come with Extendable Clip 2 Spare Biochemical Sponges Bioceramic Balls for Freshwater Saltwater Tank - M

hygger$22.38130 rev

12mo ago

Pawfly Aquarium Large Bio Sponge Filter Quiet Betta Fry Shrimp and Small Fish Foam Filter for Fish Tank up to 60 Gallon

Pawfly$8.971,761 rev

1y ago

AQUANEAT Aquarium Electric Sponge Filter for Fish Tank with Pump with 2 Extra Sponges Middle up to 40Gal

AQUANEAT$16.5094 rev

1y ago

hygger Aquarium Sponge Filter 20-55 Gallon Fish Tank Filter for Breeding Fry Shrimp Snails Betta Air-Powered Filter with Reusable Biochemical Ball Spare Sponge Foam Filter

hygger$15.59398 rev

2y ago

What buyers say about sponge filter

What buyers praise and complain about, mined from review topics.

What buyers love

Filtration31%

“Great quality filter”

Quality-Overall10%

“Great quality filter”

Size-Overall9%

“Fits good”

Value For Money8%

“Good deal”

Ease Of Cleaning8%

“has been doing a great job at keeping it clean”

Advertised Vs Actual Product7%

“Exactly what I needed”

Ease Of Use4%

“Easy to use”

Durability3%

“they're durable”

Water Flow3%

“Water flow was strong”

Spray/Flow2%

“the water flows great”

What buyers complain about

Size-Overall22%

“Very large”

Filtration13%

“Not good filters”

Durability9%

“Broken”

Quality-Overall6%

“Very poor quality sponge”

Functionality-Overall5%

“Does not stay down very well”

Value For Money3%

“Too much money for the amount received”

Water Resistance2%

“basically doesn't allow any water to get through”

Advertised Vs Actual Product2%

“The title is misleading”

Ease Of Cleaning2%

“Not great for cleaning water”

Design-Overall2%

“Bad design”

Top return reasons

Size-Overall54%

Filtration18%

Advertised Vs Actual Product6%

Functionality-Overall5%

Defective Material/Parts3%

Value For Money3%

Compatibility-Overall1%

Material Quality1%

Product Condition1%

Thickness1%

Common questions

Is sponge filter profitable to sell on Amazon United States?: The niche generates $393K/yr across 43 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -7.6%. Flapen's verdict: Worth a look (50/100).
How competitive is the sponge filter niche?: 9 brands and 15 sellers compete. The top 5 products take 38% of clicks and top 5 brands hold 90% of demand.
What do buyers complain about in sponge filter?: Top complaints mined from reviews: Size-Overall, Filtration, Durability. The return rate is 2.0%.
When does demand for sponge filter peak?: Demand is steady year-round — the busiest month runs 1.4× the quietest.
What does it cost to enter the sponge filter niche?: Listings span $5.92–$26.28; the average listing price is $13.40 (sweet spot $15–$100). The average incumbent carries 1,898 reviews — the moat a new listing must climb.