Is external filter aquarium profitable to sell on Amazon United Kingdom?

The niche generates £153K/yr across 22 tracked products. 0 of 8 products launched in the last 360 days are still selling. 90-day search growth is -20.3%. Flapen's verdict: Skip it (49/100).

How competitive is the external filter aquarium niche?

10 brands and 46 sellers compete. The top 5 products take 60% of clicks and top 5 brands hold 87% of demand.

What do buyers complain about in external filter aquarium?

Top complaints mined from reviews: Filtration, Leak-Proof, Size-Overall. The return rate is 1.4%.

When does demand for external filter aquarium peak?

Demand is steady year-round — the busiest month runs 1.6× the quietest.

What does it cost to enter the external filter aquarium niche?

Listings span £24.32–£98.75; the average listing price is £53.40 (sweet spot $15–$100). The average incumbent carries 943 reviews — the moat a new listing must climb.

external filter aquarium

Skip it

Soft demand (-20.3% this quarter) — this niche doesn't clear our bar today.

Price range

Incredible£24.32–£98.75

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

Avg price

Great£53.40

avg listing price — sweet spot $15–$100

Quality gap

Great4.1★

avg incumbent rating — lower means beatable quality

Returns

Great1.4%

return rate — above 5% kills the launch gate

Review moat

Good943

avg incumbent reviews — the moat a new listing must climb

Competition

Okay60%

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

Market size

Okay£153K

£153K/yr · 151K searches

Brand share

Okay87%

top-5 brand share — brands hold most of the demand

Conversion

Bad1.9%

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

Growth

Bad-20.3%

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

Signals High Price

According to Flapen's Amazon United Kingdom niche tracking, external filter aquarium is a £153K/yr Amazon United Kingdom market (151K searches/yr). The top 5 brands hold 87% of demand. Verdict: Skip it — 49/100.

Data updated Jul 29, 2026 · scored weekly · How we score niches

external filter aquarium market data

Units sold / yr: 2K–2K; avg 0–100/product
Revenue / yr: £80K–£107K; units × avg price
Conversion rate: 1.9%
Avg BSR: #115
Page quality: 0%
Prime: 77%
Sponsored: 91%
Out of stock: 8.5%
Avg brand age: 76 months
Avg seller age: 181 days

Competition & brand share

The top 5 products take 60% of clicks — established leaders, but buyers still shop beyond them.

Brands

10 falling

Sellers

Top-5 brand share

87%

Top 20: 100%

Top-5 click share

60%

Top 20: 98%

Open market

allpondsolutions47%
Fluval16%
Fishnanny11%
AQQA7%
hygger6%
Hidom4%
Open — no brand owns it (4 brands, 9%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -20.3% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.6×

Open Trend

Top external filter aquarium search terms

external fish tank filter22K/yr -20.0%1.4% conv.
external filter aquarium26K/yr -33.7%1.3% conv.
canister filter aquarium17K/yr -9.9%0.7% conv.
external aquarium filter17K/yr -21.2%1.3% conv.
canister filter11K/yr -11.4%0.7% conv.
aquarium external filter11K/yr -17.6%1.0% conv.
external filter10K/yr -26.9%0.8% conv.
aquarium filter external6K/yr -11.7%1.2% conv.
aquarium canister filter5K/yr -10.7%1.1% conv.
fish tank external filter6K/yr -18.2%0.9% conv.

All search terms

Top external filter aquarium 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 22 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

allpondsolutions EF-150 Aquarium External Fish Tank Water Filter for Coldwater or Tropical Aquariums for Tanks Up to 150 Litres Includes Filter Media hose and Spray Bar - Full Kit.

allpondsolutions£28.774.2★3,303 rev

allpondsolutions 1000EF Aquarium External Fish Tank Water Filter for Coldwater Tropical or Marine Aquariums for Tanks Up to 400 Litres Includes Filter Media hose and Spray Bar - Full Kit.

allpondsolutions£53.394.4★3,919 rev

Fluval 107 External Filter 1 kg

Fluval£87.614.4★1,724 rev

Fluval 207 External Filter

Fluval£98.754.5★3,182 rev

Fishnanny External Fish Tank Filter Ultra-Quiet External Aquarium Filter Canister with Filter MediaCanister filter Aquarium Cartridge Include Sponge Bio-ball Activated Carbon 18W for 250L Aquariums

Fishnanny£74.614.5★14 rev

Newest

by launch date

1400L/H Ultra-Silent External Fish Tank Filter Canister with Adjustable Flow Rate Multiple Bio-Function External Aquarium Filter with Filter Sponge Activated Carbon Bio-Ball for Fresh & Saltwater

Fishnanny£76.634 rev

1mo ago

Fishnanny External Filter Aquarium mit DC Controller & Feeding Pause Mode Quiet Adjustable Flow External Fish Tank Filters 25dB 5-Stage Canister Filter with Sponge & Quartz-Ball for Fresh/Saltwater

Fishnanny£65.0311 rev

6mo ago

hygger External Filter Aquarium 9W Dual Flow Water Filter 450L/H Hang On Aquarium Filter for 27-74L Fish Tank Collection Waste Discharge for Freshwater Saltwater

hygger£33.6013 rev

7mo ago

Fishnanny External Fish Tank Filter Ultra-Quiet External Aquarium Filter Canister with Filter MediaCanister filter Aquarium Cartridge Include Sponge Bio-ball Activated Carbon 18W for 250L Aquariums

Fishnanny£74.6114 rev

7mo ago

AQQA External Aquarium Filter 1200L/h Adjustable Canister Filter Aquarium External Filter for Tanks up to 250L - Includes 3-Stage Filtration & Complete Accessories

AQQA£54.5441 rev

11mo ago

What buyers say about external filter aquarium

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

What buyers love

Filtration40%

“Decent filter”

Quality-Overall17%

“It feels well made”

Value For Money12%

“worth the price”

Spray/Flow4%

“Adjustable flow is brilliant on it”

Ease Of Cleaning4%

“Easy to clean”

Size-Overall2%

“Good size”

Water Flow2%

“stable water parameters”

Ease Of Use2%

“Ease of use”

Durability2%

“Very durable and good quality”

Advertised Vs Actual Product1%

“These are clearly described on the box”

What buyers complain about

Filtration11%

“Im very disappointed in this filter”

Leak-Proof9%

“leaked”

Size-Overall8%

“huge”

Durability8%

“Suddenly stopped working after only a couple months use”

Quality-Overall7%

“Absolutely rubbish”

Assembly/Installation6%

“Awful to setup”

Functionality-Overall4%

“IS NOT WORKING”

Value For Money4%

“It's a budget canister filter at the wrong pricing of 80 quid at present”

Instructions/User Manual/Troubleshooting4%

“The instructions are not the best”

Water Flow3%

“The flow rate isn't the best so if you have fish that like fast flow this isn't the filter for you”

Top return reasons

Size-Overall25%

Functionality-Overall16%

Filtration13%

Leak-Proof12%

Defective Material/Parts10%

Compatibility-Overall5%