top fin rf-l filter cartridges
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Conversion
Incredible24.4%search→purchase rate — share of searches ending in a sale
Review moat
Great327.17avg incumbent reviews — the moat a new listing must climb
Returns
Great1.9%return rate — above 6% kills the launch gate
Avg price
Great$15.83avg listing price — sweet spot $15–$100
Price range
Good$12.86–$19.59cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Okay+11.8%90-day search growth — must beat 0% to launch
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Market size
Bad$12K$12K/yr · 3K searches
Competition
Bad97%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 rf-l filter cartridges is a $12K/yr Amazon United States market (3K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jul–Aug. Verdict: Skip it — 38/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
top fin rf-l filter cartridges market data
- Units sold / yr
- 750–1K
- avg 0–100/product
- Revenue / yr
- $12K–$16K
- units × avg price
- Launch success
- —
- 0 of 1 new (360d)
- Conversion rate
- 24.4%
- Avg BSR
- #545
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 67%
- Out of stock
- 0.0%
- Avg brand age
- 20 months
- Avg seller age
- 128 days
Competition & brand share
The top 5 products capture 97% of clicks — a locked-up shelf that new listings rarely crack.Brands
5 falling
Sellers
33
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
97%
Top 20: 100%
Open market
0%
- Switior68%
- Top Fin12%
- Czarixa11%
- Yoolight6%
- SAMANIJA3%
- Open — no brand owns it (0%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +11.8% search growth over the last 90 days.Peak months: Jul, Aug · busiest ÷ quietest = 1.7×
Top top fin rf-l 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 6 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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$15.634.7★217 rev
Switior 12 Pack Large Filter Cartridge for Top Fin RF-L Filter Aqurium Filter Cartridge Refill for Top Fin Desktop Aquariums with Large Retreat Filter
Switior$18.384.7★217 rev
Top Fin Retreat Filter Large RF-L (6 Count)
Top Fin$19.594.7★1,377 rev
Czarixa 8 Pcs RF-L Fish Tank Filter Cartridges for Topfin L Retreat Filters Aquarium Replacement Large Filter Cartridge with Carbon Compatible with Top Fin Desktop Aquariums with Large Retreat Filter
Czarixa$14.884.8★6 rev
Yoolight 6 Pack RF-L Large Retreat Filter Cartridges Compatible with Aquarium Remplacement Aquarium Carbon Cartridge
Yoolight$13.654.5★48 rev
Newest
by launch dateCzarixa 8 Pcs RF-L Fish Tank Filter Cartridges for Topfin L Retreat Filters Aquarium Replacement Large Filter Cartridge with Carbon Compatible with Top Fin Desktop Aquariums with Large Retreat Filter
Czarixa$14.886 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
Switior 12 Pack Large Filter Cartridge for Top Fin RF-L Filter Aqurium Filter Cartridge Refill for Top Fin Desktop Aquariums with Large Retreat Filter
Switior$18.38217 rev
Yoolight 6 Pack RF-L Large Retreat Filter Cartridges Compatible with Aquarium Remplacement Aquarium Carbon Cartridge
Yoolight$13.6548 rev
SAMANIJA 6-Pack Fish Tank Aquarium Filters Replacement for Top Fin RF-L Large Retreat Filter Cartridges
SAMANIJA$12.8698 rev
Trending
90-day click momentumCzarixa 8 Pcs RF-L Fish Tank Filter Cartridges for Topfin L Retreat Filters Aquarium Replacement Large Filter Cartridge with Carbon Compatible with Top Fin Desktop Aquariums with Large Retreat Filter
Czarixa$14.884.8★
Yoolight 6 Pack RF-L Large Retreat Filter Cartridges Compatible with Aquarium Remplacement Aquarium Carbon Cartridge
Yoolight$13.654.5★
Switior 12 Pack Large Filter Cartridge for Top Fin RF-L Filter Aqurium Filter Cartridge Refill for Top Fin Desktop Aquariums with Large Retreat Filter
Switior$18.384.7★
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$15.634.7★
Top Fin Retreat Filter Large RF-L (6 Count)
Top Fin$19.594.7★
What buyers say about top fin rf-l filter cartridges
What buyers praise and complain about, mined from review topics.What buyers love
“These aquarium filters are quite good”
“Works as expected”
“Fits perfect on my aquarium setup and keeps it very clean, exactly same size as original and fits and works perfect”
“Keeps tank clean”
“Same size and very good quality”
“Value for money”
“The water is very clear”
What buyers complain about
“It's like looking through a window pain after you have cleaned it”
Top return reasons
Common questions
- Is top fin rf-l filter cartridges profitable to sell on Amazon United States?
- The niche generates $12K/yr across 6 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +11.8%. Flapen's verdict: Skip it (38/100).
- How competitive is the top fin rf-l filter cartridges niche?
- 5 brands and 33 sellers compete. The top 5 products take 97% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in top fin rf-l filter cartridges?
- Top complaints mined from reviews: Ease Of Cleaning. The return rate is 1.9%.
- When does demand for top fin rf-l filter cartridges peak?
- Demand peaks in Jul–Aug; the busiest month runs 1.7× the quietest.
- What does it cost to enter the top fin rf-l filter cartridges niche?
- Listings span $12.86–$19.59; the average listing price is $15.83 (sweet spot $15–$100). The average incumbent carries 327 reviews — the moat a new listing must climb.