---
title: "Top Fin Filter Cartridges — $226K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/pet-supplies/top-fin-filter-cartridges"
last_updated: "2026-07-21T18:45:38.542Z"
locale: en
meta:
description: "Niche score 44/100 · $226K/yr market · 226K searches/yr · $15.20 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 44/100 · $226K/yr market · 226K searches/yr · $15.20 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Top Fin Filter Cartridges — $226K/yr Amazon US Niche (2026) - Flapen"
---
# **top fin filter cartridges**
**Skip it**
Brand-locked demand (top 5 brands take 95% of clicks) — this niche doesn't clear our bar today.
Market size 43Growth 16Conversion 72Competition 66Returns 49Price range 71Avg price 76Brand share 12Review moat 35Quality gap 32
**Avg price**
**Great****$15.20**
avg listing price — sweet spot $15–$100
**Conversion**
**Good****6.6%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Good****$7.70–$32.94**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Good****45%**
top-5 click share — leaders hold, buyers still browse
**Returns**
**Okay****3.2%**
return rate — above 6% kills the launch gate
**Market size**
**Okay****$226K**
$226K/yr · 226K searches
**Review moat**
**Okay****3,004.77**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-17.0%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****95%**
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 ~~](https://flapen.com/research/methodology)
## **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.
6K4KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jan · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/us/pet-supplies/top-fin-filter-cartridges/trend)
## **Top top fin filter cartridges search terms**
- **top fin filter cartridges**75K/yr-21.8%9.3% conv. - **topfin aquarium filter**46K/yr-8.7%6.5% conv. - **top fin filter**36K/yr-19.6%3.0% conv. - **top fin**37K/yr-17.0%0.6% conv. - **top fin aquarium filter**9K/yr-22.3%2.4% conv. - **topfin**6K/yr-11.8%1.7% conv. - **topfin filter**5K/yr+10.0%5.7% conv. - **top fin filters**5K/yr-7.7%6.0% conv. - **top fin fish tank filter**5K/yr-10.6%4.9% conv. - **top fin small filter cartridge**2K/yr-65.6%10.7% conv. [**All search terms **](https://flapen.com/research/us/pet-supplies/top-fin-filter-cartridges/search-terms)
## **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.
0%4%$9K8%$18K12%$27K16%$36K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 31 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Top Fin Silenstream Large PF-L Filter Cartridges Refill**Top Fin**$24.32**4.8★627 rev](https://www.amazon.com/dp/B0BXBP5GZP) [2**Top Fin Silenstream PF-S Refill for PF10 Power Filters 5.5in x 3.1 - (3 Count)**Top Fin**$13.93**4.7★1,625 rev](https://www.amazon.com/dp/B08NGVZJVZ) [3**HiTauing 8 Pack EF-S Filter Cartridges for EF-S Element and BF5 BETTAFLO**HiTauing**$8.69**4.6★3,205 rev](https://www.amazon.com/dp/B0B9656RGN) [4**HiTauing 12 Packs PF-S Filter Cartridge for PF10 Power Filters ONLY fit to Model PF10 Power Filters**HiTauing**$11.40**4.6★2,404 rev](https://www.amazon.com/dp/B09ZL5RGLJ) [5**15 Pack Filter Cartridges for Filter Replacement Filter Cartridges for Top Fin EF-S Element and BF5 BETTAFLO**Zuqqony**$13.65**4.6★523 rev](https://www.amazon.com/dp/B0CZ8DJP5F)
**~~View all top sellers →~~**
### **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**$8.69**103 rev1y ago](https://www.amazon.com/dp/B0FC29K2MN) [**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**$19.82**66 rev1y ago](https://www.amazon.com/dp/B0F9X7YGN3) [**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**$15.63**217 rev1y ago](https://www.amazon.com/dp/B0DKX88PWY) [**15 Pack Filter Cartridges for Filter Replacement Filter Cartridges for Top Fin EF-S Element and BF5 BETTAFLO**Zuqqony**$13.65**523 rev2y ago](https://www.amazon.com/dp/B0CZ8DJP5F) [**Zuqqony 8 Pack Filter Cartridges for Filter Replacement Filter Cartridges for Top Fin EF-S Element and BF5 BETTAFLO**Zuqqony**$8.77**523 rev2y ago](https://www.amazon.com/dp/B0CZ87KZML)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Top Fin Silenstream PF-S Refill for PF10 Power Filters 5.5in x 3.1 - (3 Count)**Top Fin**$13.93**4.7★**▲ 295%**](https://www.amazon.com/dp/B08NGVZJVZ) [**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**$10.02**4.6★**▲ 182%**](https://www.amazon.com/dp/B0C3MBHLXK) [**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**$9.54**4.5★**▲ 146%**](https://www.amazon.com/dp/B0C2821RCM) [**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**$19.82**4.7★**▲ 135%**](https://www.amazon.com/dp/B0F9X7YGN3) [**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**$20.87**4.5★**▲ 110%**](https://www.amazon.com/dp/B0C281W8S6)
**~~View all trending →~~**
## **What buyers say about top fin filter cartridges**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**26%
*“Filters work well”*
**Value For Money**18%
*“Good for the price”*
**Quality-Overall**12%
*“The quality has been consistent”*
**Size-Overall**11%
*“sizing is accurate”*
**Advertised Vs Actual Product**7%
*“As advertised”*
**Ease Of Cleaning**6%
*“It is doing a good job in keeping the tank clean”*
**Water Flow**3%
*“Works Perfectly and Keeps the Water Clean”*
**Spray/Flow**2%
*“Great flow and cleared water”*
**Ease Of Use**2%
*“ease of use”*
**Durability**2%
*“Good value en durability”*
### **What buyers complain about **
**Durability**21%
*“Breaks easily”*
**Filtration**19%
*“filtration is weak”*
**Quality-Overall**9%
*“Bad quality control”*
**Size-Overall**7%
*“It doesnt fit the fitter”*
**Water Flow**5%
*“It agitates the water way too much”*
**Leak-Proof**4%
*“Half of the water leaks before it reaches the filter”*
**Functionality-Overall**4%
*“Doesnt work”*
**Ease Of Cleaning**3%
*“Tank got so dirty within a week”*
**Value For Money**2%
*“Costs more to return”*
**Design-Overall**2%
*“Very cheap and poorly constructed”*
### **Top return reasons **
**Size-Overall**69%
**Filtration**15%
**Compatibility-Overall**3%
**Advertised Vs Actual Product**3%
**Functionality-Overall**3%
**Defective Material/Parts**2%
**Value For Money**1%
**Durability**1%
**Leak-Proof**1%
**Product Condition**1%
## **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.
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