Is sponge filter 5 gallon profitable to sell on Amazon United States?

The niche generates $156K/yr across 33 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is +1.2%. Flapen's verdict: Skip it (47/100).

How competitive is the sponge filter 5 gallon niche?

12 brands and 18 sellers compete. The top 5 products take 46% of clicks and top 5 brands hold 91% of demand.

What do buyers complain about in sponge filter 5 gallon?

Top complaints mined from reviews: Durability, Size-Overall, Filtration. The return rate is 2.4%.

When does demand for sponge filter 5 gallon peak?

Demand peaks in May; the busiest month runs 1.7× the quietest.

What does it cost to enter the sponge filter 5 gallon niche?

Listings span $5.91–$23.81; the average listing price is $10.93 (sweet spot $15–$100). The average incumbent carries 1,626 reviews — the moat a new listing must climb.

sponge filter 5 gallon

Skip it

Brand-locked demand (top 5 brands take 91% of clicks) — this niche doesn't clear our bar today.

Competition

Good46%

top-5 click share — leaders hold, buyers still browse

Returns

Good2.4%

return rate — above 6% kills the launch gate

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Conversion

Good5.2%

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

Review moat

Okay1,625.64

avg incumbent reviews — the moat a new listing must climb

Price range

Okay$5.91–$23.81

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

Avg price

Okay$10.93

avg listing price — sweet spot $15–$100

Market size

Okay$156K

$156K/yr · 273K searches

Growth

Okay+1.2%

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

Brand share

Bad91%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, sponge filter 5 gallon is a $156K/yr Amazon United States market (273K searches/yr). The top 5 brands hold 91% of demand. Demand peaks in May. Verdict: Skip it — 47/100.

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

sponge filter 5 gallon market data

Units sold / yr: 13K–15K; avg 250–500/product
Revenue / yr: $137K–$164K; units × avg price
Launch success: —; 0 of 2 new (360d)
Conversion rate: 5.2%
Avg BSR: #111
Page quality: 0%
Prime: 100%
Sponsored: 91%
Out of stock: 3.0%
Avg brand age: 48 months
Avg seller age: 178 days

Competition & brand share

The top 5 products take 46% of clicks — established leaders, but buyers still shop beyond them.

Brands

12 rising

Sellers

Top-5 brand share

91%

Top 20: 100%

Top-5 click share

46%

Top 20: 86%

Open market

AQUANEAT41%
Pawfly27%
hygger14%
AQQA6%
Carefree Fish3%
DEGGOX2%
Open — no brand owns it (6 brands, 7%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +1.2% search growth over the last 90 days.

Peak months: May · busiest ÷ quietest = 1.7×

Open Trend

Top sponge filter 5 gallon search terms

sponge filter 5 gallon56K/yr +1.3%4.7% conv.
sponge filter 10 gallon49K/yr +6.1%4.3% conv.
sponge filter 10+ gallon43K/yr +0.2%3.5% conv.
small sponge filter30K/yr +0.9%4.9% conv.
mini sponge filter17K/yr +4.3%4.2% conv.
nano sponge filter13K/yr +3.0%3.3% conv.
10 gallon sponge filter12K/yr +9.9%5.5% conv.
sponge filter 5+ gallon11K/yr +2.2%4.9% conv.
5 gallon sponge filter10K/yr -3.3%4.3% conv.
sponge filter for 10 gallon tank8K/yr -9.3%3.5% conv.

All search terms

Top sponge filter 5 gallon 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 33 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 Air Powered Sponge Filter Fish Tank Bio Bubble Filter with Airline Tubing Valves Suction Cup(up to 10Gal)

AQUANEAT$6.334.7★3,143 rev

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

AQUANEAT$5.924.7★9,197 rev

Pawfly Aquarium Sponge Filter Mini Sponge Filter Kit with Airline Tubing and Control Valve for Small Fish Tank up to 3 Gallon

Pawfly$5.924.5★1,964 rev

Newest

by launch date

Carefree Fish Aquarium Small Sponge Bubble Filter with Fish Poops Collector Quiet for 3~8Gal Fish Tank for Saltwater and Freshwater(Not Include Air Pump)

Carefree Fish$9.8230 rev

3mo ago

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

UNEAK Extra Small Aquarium Sponge Filter Fish Tank Silent Filteration Breeding Fry Betta Shrimp Nano Tank Accessories Air Stone 4-inch Airline Tubing up to 5 Gallon

UNEAK$8.5685 rev

1y ago

UPETTOOLS Mini Aquarium Sponge Filter Small Fish Tank Filter Submersible Fish Filter Built-in Air Bubble Stone and Bio Balls for Fish Tanks up to 5 Gallon (Air Pump Not Included)

UPETTOOLS$8.50229 rev

2y ago

Pawfly Mini Aquarium Sponge Filter Small Fish Tank Internal Filter with Foam and Air Stone Submersible Bio Sponge Filter for Fish Tanks up to 5 Gallon (Air Pump & Airline Tubing Not Included)

Pawfly$7.49541 rev

2y ago

What buyers say about sponge filter 5 gallon

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

What buyers love

Filtration33%

“Decent Filter”

Quality-Overall9%

“Good Quality”

Value For Money8%

“Good deal”

Size-Overall7%

“Its a very snug fit”

Ease Of Cleaning6%

“It cleans well”

Advertised Vs Actual Product5%

“Exactly as advertised”

Ease Of Use3%

“Easy to use”

Water Flow3%

“Keeps the water clean and clear”

Spray/Flow2%

“Gentle flow and very quiet”

Durability2%

“- product is durable”

What buyers complain about

Durability19%

“Broken”

Size-Overall16%

“Short one”

Filtration13%

“Not filtering”

Quality-Overall5%

“Very poor quality sponge”

Functionality-Overall5%

“DOESN'T WORK”

Leak-Proof4%

“Water leak”

Ease Of Cleaning4%

“not sure of cleaning capabilities”

Instructions/User Manual/Troubleshooting2%

“No Instructions”

Water Flow1%

“Does not pull water”

Advertised Vs Actual Product1%

“False advertising”

Top return reasons

Size-Overall50%

Filtration21%

Functionality-Overall6%

Advertised Vs Actual Product6%

Defective Material/Parts4%

Value For Money2%

Compatibility-Overall2%