Is phosphate remover profitable to sell on Amazon United Kingdom?

The niche generates £103K/yr across 31 tracked products. 2 of 5 products launched in the last 360 days are still selling. 90-day search growth is -15.2%. Flapen's verdict: Worth a look (53/100).

How competitive is the phosphate remover niche?

11 brands and 68 sellers compete. The top 5 products take 41% of clicks and top 5 brands hold 82% of demand.

What do buyers complain about in phosphate remover?

Top complaints mined from reviews: Size-Overall, Value For Money, Quality-Overall. The return rate is 0.4%.

When does demand for phosphate remover peak?

Demand is steady year-round — the busiest month runs 1.4× the quietest.

What does it cost to enter the phosphate remover niche?

Listings span £4.08–£38.83; the average listing price is £13.64 (sweet spot $15–$100). The average incumbent carries 1,332 reviews — the moat a new listing must climb.

phosphate remover

Worth a look

Shows low returns (0.4%), but soft demand (-15.2% this quarter) keeps it on the watch list.

Returns

Incredible0.4%

return rate — above 5% kills the launch gate

Conversion

Great10.0%

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

Competition

Good41%

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

Price range

Good£4.08–£38.83

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

Avg price

Good£13.64

avg listing price — sweet spot $15–$100

Review moat

Good1,332

avg incumbent reviews — the moat a new listing must climb

Brand share

Okay82%

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

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Market size

Okay£103K

£103K/yr · 75K searches

Growth

Bad-15.2%

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

According to Flapen's Amazon United Kingdom niche tracking, phosphate remover is a £103K/yr Amazon United Kingdom market (75K searches/yr). The top 5 brands hold 82% of demand. Verdict: Worth a look — 53/100.

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

phosphate remover market data

Units sold / yr: 5K–6K; avg 100–250/product
Revenue / yr: £68K–£82K; units × avg price
Conversion rate: 10.0%
Avg BSR: #176
Page quality: 0%
Prime: 84%
Sponsored: 61%
Out of stock: 2.9%
Avg brand age: 53 months
Avg seller age: 184 days

Competition & brand share

The top 5 products take 41% of clicks — established leaders, but buyers still shop beyond them.

Brands

11 rising

Sellers

Top-5 brand share

82%

Top 20: 100%

Top-5 click share

41%

Top 20: 89%

Open market

13%

Fluval51%
TGC12%
ARKA7%
Supa7%
beaufan6%
Intralabs4%
Open — no brand owns it (5 brands, 13%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -15.2% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top phosphate remover search terms

activated carbon24K/yr -16.4%4.5% conv.
fluval 307 filter media18K/yr -16.8%8.6% conv.
carbon9K/yr -6.3%1.2% conv.
fluval 407 filter media5K/yr -28.9%9.0% conv.
fluval filter media5K/yr -23.3%4.0% conv.
activated carbon aquarium5K/yr -22.3%8.9% conv.
aquarium carbon4K/yr -32.7%8.9% conv.
activated carbon for ponds4K/yr +248.6%4.9% conv.

All search terms

Top phosphate remover 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 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Fluval Carbon 800g complete with net bags

Fluval£8.684.6★7,092 rev

ACTIVATED CARBON 1000g AQUARIUM FISH TANK 3D PRINTING EXTERNAL FILTER MEDIA/KOI FISH POND WATER DECHLORINATOR FILTERS 1KG Kilo

TGC£9.944.5★106 rev

FLUVAL 307/407 Media Value Pack

Fluval£38.834.7★712 rev

Fluval 306/307 Filter Media Bio-Foam Value Pack

Fluval£14.824.7★2,909 rev

Fluval 306/7 and 406/7 Filter Water Polishing Pad

Fluval£5.264.7★3,820 rev

Newest

by launch date

beaufan 38 Pack Aquarium Filter Media Kit Compatible with Fluval 406/407 Canister Filters Includes Replacement Bio-Foams Activated Carbon & Ceramic Rings (2 Sets Maintenance Bundle)

beaufan£38.3022 rev

4mo ago

beaufan 38 Pack Aquarium Filter Media Kit Compatible with Fluval 306/307 Canister Filters Includes Bio Foam Activated Carbon & Ceramic Rings (2 Sets Maintenance Bundle)

beaufan£38.2422 rev

6mo ago

36 Pcs Filter Media Kit for Fluval 306/307 Canister Filters Include Water Polishing Pad Bio-Foam Pad Ammonia/Phosphate/Nitrite Remover 500g BioMax Media 500g Carbon Silicone Lube Filter Mesh Bag

Tofcbye£28.1047 rev

8mo ago

3 KILO 3KG ACTIVATED CARBON AQUARIUM 4MM DIAMETER PELLETS FISH TANK EXTERNAL FILTER MEDIA/KOI FISH POND WATER DECHLORINATOR FILTERS 3000g

TGC£20.6513 rev

8mo ago

Kenmohuo Eco-Aquarium Water Purifier Cube 2025 Activated Carbon Filter Cube Super Strong Filtration for Aquarium Fish Tank Horse Trough & Ponds | Reusable Honeycomb Purifier Block | Odor Control

Kenmohuo£11.896 rev

1y ago

What buyers say about phosphate remover

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

What buyers love

Value For Money34%

“Good value for money”

Quality-Overall18%

“Excellent product”

Advertised Vs Actual Product11%

“Perfect works as should”

Size-Overall10%

“Perfect fit”

Filtration8%

“Great product for your filter”

Ease Of Cleaning5%

“Keeps my tank looking clean for longer than others”

Carbon Footprint2%

“Its activated carbon”

Ease Of Use2%

“Easy to use”

Compatibility-Overall2%

“Work well with my filter”

Water Resistance2%

“Makes water clear”

What buyers complain about

Size-Overall25%

“For some reason didn't fit my filter”

Value For Money19%

“expensive though”

Quality-Overall6%

“this waste if money the quality is shocking I found pieces of wood that was painted”

Taste-Overall6%

“you have charcoal flavour water”

Carbon Footprint6%

“Really, really dirty carbon”

Residue6%

“Contains a large amount of very fine particles that wash straight through a filter”

Filtration6%

“didnt have enough room in the filter for additional media”

Top return reasons

Size-Overall40%

Compatibility-Overall27%

Filtration7%

Advertised Vs Actual Product6%

Functionality-Overall5%

Quality-Overall4%

Leak-Proof2%

Defective Material/Parts2%

Product Condition2%