top fin filter cartridges
Skip itBrand-locked demand (top 5 brands take 95% of clicks) — this niche doesn't clear our bar today.
Avg price
Great$15.20avg listing price — sweet spot $15–$100
Conversion
Good6.6%search→purchase rate — share of searches ending in a sale
Price range
Good$7.70–$32.94cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Good45%top-5 click share — leaders hold, buyers still browse
Returns
Okay3.2%return rate — above 6% kills the launch gate
Market size
Okay$226K$226K/yr · 226K searches
Review moat
Okay3,004.77avg incumbent reviews — the moat a new listing must climb
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Growth
Bad-17.0%90-day search growth — must beat 0% to launch
Brand share
Bad95%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, top fin filter cartridges is a $226K/yr Amazon United States market (226K searches/yr). The top 5 brands hold 95% of demand. Demand peaks in Jan. Verdict: Skip it — 44/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
top fin filter cartridges market data
- Units sold / yr
- 15K–20K
- avg 500–750/product
- Revenue / yr
- $228K–$304K
- units × avg price
- Launch success
- —
- 0 of 0 new (360d)
- Conversion rate
- 6.6%
- Avg BSR
- #106
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 84%
- Out of stock
- 0.3%
- Avg brand age
- 58 months
- Avg seller age
- 135 days
Competition & brand share
The top 5 products take 45% of clicks — established leaders, but buyers still shop beyond them.Brands
9 rising
Sellers
179
Top-5 brand share
95%
Top 20: 100%
Top-5 click share
45%
Top 20: 91%
Open market
3%
- Top Fin34%
- Zuqqony28%
- HiTauing24%
- Tetra7%
- driamor2%
- lasuroa2%
- Open — no brand owns it (3 brands, 3%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -17.0% search growth over the last 90 days.Peak months: Jan · busiest ÷ quietest = 1.7×
Top top fin filter cartridges search terms
- top fin filter cartridges75K/yr
- topfin aquarium filter46K/yr
- top fin filter36K/yr
- top fin37K/yr
- top fin aquarium filter9K/yr
- topfin6K/yr
- topfin filter5K/yr
- top fin filters5K/yr
- top fin fish tank filter5K/yr
- top fin small filter cartridge2K/yr
Top top fin 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.
All 31 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Top Fin Silenstream Large PF-L Filter Cartridges Refill
Top Fin$24.324.8★627 rev
Top Fin Silenstream PF-S Refill for PF10 Power Filters 5.5in x 3.1 - (3 Count)
Top Fin$13.934.7★1,625 rev
HiTauing 8 Pack EF-S Filter Cartridges for EF-S Element and BF5 BETTAFLO
HiTauing$8.694.6★3,205 rev
HiTauing 12 Packs PF-S Filter Cartridge for PF10 Power Filters ONLY fit to Model PF10 Power Filters
HiTauing$11.404.6★2,404 rev
15 Pack Filter Cartridges for Filter Replacement Filter Cartridges for Top Fin EF-S Element and BF5 BETTAFLO
Zuqqony$13.654.6★523 rev
Newest
by launch date
lasuroa Filter Cartridges Compatible with Topfin Top Fin EF-S & BF5 BETTAFLO 3.7x2.1 Inch Fish Tank Filter Cartridge Replacement for Aquarium Water Filtration (EF-S 6)
lasuroa$8.69103 rev
ELCCOTYA 16 Pack PF-L Fish Tank Filter Cartridges Aquarium Filter Cartridges Replacement Compatible with Top Fin Silenstream PF20 PF30 PF40 and PF75 Power Filters
ELCCOTYA$19.8266 rev
Switior 8 Pack Filter Cartridge for Top Fin RF-L Filter Aqurium Filter Cartridge Refill for Top Fin Desktop Aquariums with Large Retreat Filter
Switior$15.63217 rev
15 Pack Filter Cartridges for Filter Replacement Filter Cartridges for Top Fin EF-S Element and BF5 BETTAFLO
Zuqqony$13.65523 rev
Zuqqony 8 Pack Filter Cartridges for Filter Replacement Filter Cartridges for Top Fin EF-S Element and BF5 BETTAFLO
Zuqqony$8.77523 rev
Trending
90-day click momentumTop Fin Silenstream PF-S Refill for PF10 Power Filters 5.5in x 3.1 - (3 Count)
Top Fin$13.934.7★
Hedday 8 Packs Filter Cartridge Compatible with Top Fin EF-S Element 8 Packs Aquarium Filter for BF5 BETTAFLO EF-S Filter Cartridges Compatible with Top Fin Fish Tank
Hedday$10.024.6★
driamor 6 Pack PF-L Filter Cartridges Fish Tank Aquarium Filter Cartridge Replacement with Zeolite Compatible with PF20 PF30 PF40 and PF75 Power Filters
driamor$9.544.5★
ELCCOTYA 16 Pack PF-L Fish Tank Filter Cartridges Aquarium Filter Cartridges Replacement Compatible with Top Fin Silenstream PF20 PF30 PF40 and PF75 Power Filters
ELCCOTYA$19.824.7★
driamor 16 Pack PF-L Fish Tank Filter Cartridges Compatible with PF20 PF30 PF40 and PF75 Power Filters Aquarium Large Carbon Filters Cartridge Replacement
driamor$20.874.5★
What buyers say about top fin filter cartridges
What buyers praise and complain about, mined from review topics.What buyers love
“Filters work well”
“Good for the price”
“The quality has been consistent”
“sizing is accurate”
“As advertised”
“It is doing a good job in keeping the tank clean”
“Works Perfectly and Keeps the Water Clean”
“Great flow and cleared water”
“ease of use”
“Good value en durability”
What buyers complain about
“Breaks easily”
“filtration is weak”
“Bad quality control”
“It doesnt fit the fitter”
“It agitates the water way too much”
“Half of the water leaks before it reaches the filter”
“Doesnt work”
“Tank got so dirty within a week”
“Costs more to return”
“Very cheap and poorly constructed”
Top return reasons
Common questions
- Is top fin filter cartridges profitable to sell on Amazon United States?
- The niche generates $226K/yr across 31 tracked products. 90-day search growth is -17.0%. Flapen's verdict: Skip it (44/100).
- How competitive is the top fin filter cartridges niche?
- 9 brands and 179 sellers compete. The top 5 products take 45% of clicks and top 5 brands hold 95% of demand.
- What do buyers complain about in top fin filter cartridges?
- Top complaints mined from reviews: Durability, Filtration, Quality-Overall. The return rate is 3.2%.
- When does demand for top fin filter cartridges peak?
- Demand peaks in Jan; the busiest month runs 1.7× the quietest.
- What does it cost to enter the top fin filter cartridges niche?
- Listings span $7.70–$32.94; the average listing price is $15.20 (sweet spot $15–$100). The average incumbent carries 3,005 reviews — the moat a new listing must climb.