Is top fin ef-s filter cartridges profitable to sell on Amazon United States?

The niche generates $110K/yr across 9 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -4.5%. Flapen's verdict: Skip it (37/100).

How competitive is the top fin ef-s filter cartridges niche?

5 brands and 48 sellers compete. The top 5 products take 84% of clicks and top 5 brands hold 100% of demand.

What do buyers complain about in top fin ef-s filter cartridges?

Top complaints mined from reviews: Filtration, Size-Overall, Quality-Overall. The return rate is 1.8%.

When does demand for top fin ef-s filter cartridges peak?

Demand peaks in Jan–Nov; the busiest month runs 1.9× the quietest.

What does it cost to enter the top fin ef-s filter cartridges niche?

Listings span $7.24–$18.66; the average listing price is $11.00 (sweet spot $15–$100). The average incumbent carries 1,275 reviews — the moat a new listing must climb.

top fin ef-s filter cartridges

Skip it

Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.

Conversion

Incredible21.1%

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

Returns

Great1.8%

return rate — above 6% kills the launch gate

Review moat

Good1,274.78

avg incumbent reviews — the moat a new listing must climb

Avg price

Okay$11.00

avg listing price — sweet spot $15–$100

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Price range

Okay$7.24–$18.66

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

Market size

Okay$110K

$110K/yr · 48K searches

Growth

Bad-4.5%

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

Competition

Bad84%

top-5 click share — a locked-up shelf

Brand share

Bad100%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, top fin ef-s filter cartridges is a $110K/yr Amazon United States market (48K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jan–Nov. Verdict: Skip it — 37/100.

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

top fin ef-s filter cartridges market data

Units sold / yr: 8K–10K; avg 750–1,000/product
Revenue / yr: $88K–$110K; units × avg price
Launch success: —; 0 of 1 new (360d)
Conversion rate: 21.1%
Avg BSR: #97
Page quality: 0%
Prime: 100%
Sponsored: 89%
Out of stock: 0.0%
Avg brand age: 56 months
Avg seller age: 145 days

Competition & brand share

The top 5 products capture 84% of clicks — a locked-up shelf that new listings rarely crack.

Brands

5 flat

Sellers

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

84%

Top 20: 100%

Open market

HiTauing73%
Top Fin11%
Zuqqony8%
driamor4%
Meidier4%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -4.5% search growth over the last 90 days.

Peak months: Jan, Nov · busiest ÷ quietest = 1.9×

Open Trend

Top top fin ef-s filter cartridges search terms

ef-s fish tank filter12K/yr -1.4%19.8% conv.
top fin ef-s filter cartridges11K/yr -2.3%21.1% conv.
fish tank filter replacement pads5K/yr +24.5%1.6% conv.
topfin ef-s filter cartridge4K/yr -14.3%24.1% conv.
5 gallon fish tank filter cartridge4K/yr +18.8%2.6% conv.
efs fish tank filter3K/yr +2.2%19.8% conv.
top fin ef-s element filter cartridge3K/yr -24.6%22.3% conv.
ef-s filter cartridges fish tank3K/yr -5.0%19.8% conv.

All search terms

Top top fin ef-s filter cartridges 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 9 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

HiTauing 8 Pack EF-S Filter Cartridges for EF-S Element and BF5 BETTAFLO

HiTauing$8.694.6★3,205 rev

Top Fin EF-S Element Filter Cartridges (6 Count) for Fish Tank

Top Fin$18.664.7★1,320 rev

HiTauing 12 Packs Filter Cartridge Compatible with EF-S Element and BF5 BETTAFLO Filter

HiTauing$12.644.6★1,138 rev

HiTauing 6 Pack EF-S Filter Cartridges for EF-S Element and BF5 BETTAFLO

HiTauing$7.704.6★3,205 rev

HiTauing 15 Packs Filter Cartridge for EF-S Element and BF5 BETTAFLO

HiTauing$13.534.6★1,138 rev

Newest

by launch date

12-Pack EF-S Replacement Filter Cartridges for BF5 BettaFlo Aquarium Professional Triple Filtration to Keep Water Crystal Clear & Fish Healthy High-Density Activated Carbon Refills for Fish Tank

Meidier$7.2475 rev

5mo ago

Zuqqony 8 Pack Filter Cartridges for Filter Replacement Filter Cartridges for Top Fin EF-S Element and BF5 BETTAFLO

Zuqqony$8.77523 rev

2y ago

15 Pack Filter Cartridges for Filter Replacement Filter Cartridges for Top Fin EF-S Element and BF5 BETTAFLO

Zuqqony$13.65523 rev

2y ago

driamor 8 Pack Filter Cartridges Compatible with EF-S Element and BF5 BETTAFLO Filter Thickened Fish Tank Replacement Filters Cartridge with Zeolite

driamor$8.10346 rev

3y ago

HiTauing 8 Pack EF-S Filter Cartridges for EF-S Element and BF5 BETTAFLO

HiTauing$8.693,205 rev

3y ago

What buyers say about top fin ef-s filter cartridges

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

What buyers love

Value For Money29%

“Very affordable”

Size-Overall21%

“fits as it should”

Filtration20%

“Great filters”

Quality-Overall7%

“Good quality”

Ease Of Cleaning7%

“which stayed really clean”

Durability3%

“lasts a long time”

Advertised Vs Actual Product3%

“It does the job”

Ease Of Use2%

“They are super easy to use”

Water Flow1%

“Crystal Clear Water”

Water Resistance1%

“keeps water clear”

What buyers complain about

Filtration20%

“NOT a quality filter”

Size-Overall13%

“Not correct size”

Quality-Overall9%

“NOT a quality filter”

Value For Money7%

“Expensive”

Smell6%

“failing to absorb odors or discoloration in the aquarium”

Ease Of Cleaning6%

“got as dirty as the name brand in half the time”

Compatibility-Overall4%

“Bad Fit for BF5”

Indigestion4%

“Caused Health Issues for My Betta”

Advertised Vs Actual Product4%

“Did not fit filter for Top Fin EF-S Element Filter Cartridge as described”

Water Resistance2%

“making the water murkier than before use”

Top return reasons

Size-Overall82%

Filtration7%

Compatibility-Overall4%

Advertised Vs Actual Product4%

Value For Money1%

Functionality-Overall1%

Defective Material/Parts1%

Product Condition0%

Quality-Overall0%

Certifications0%

Common questions

Is top fin ef-s filter cartridges profitable to sell on Amazon United States?: The niche generates $110K/yr across 9 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -4.5%. Flapen's verdict: Skip it (37/100).
How competitive is the top fin ef-s filter cartridges niche?: 5 brands and 48 sellers compete. The top 5 products take 84% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in top fin ef-s filter cartridges?: Top complaints mined from reviews: Filtration, Size-Overall, Quality-Overall. The return rate is 1.8%.
When does demand for top fin ef-s filter cartridges peak?: Demand peaks in Jan–Nov; the busiest month runs 1.9× the quietest.
What does it cost to enter the top fin ef-s filter cartridges niche?: Listings span $7.24–$18.66; the average listing price is $11.00 (sweet spot $15–$100). The average incumbent carries 1,275 reviews — the moat a new listing must climb.