Is replacement under-sink water filters profitable to sell on Amazon United States?

The niche generates $141K/yr across 28 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is +8.6%. Flapen's verdict: Worth a look (52/100).

How competitive is the replacement under-sink water filters niche?

16 brands and 52 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 78% of demand.

What do buyers complain about in replacement under-sink water filters?

Top complaints mined from reviews: Filtration, Size-Overall, Quality-Overall. The return rate is 0.9%.

When does demand for replacement under-sink water filters peak?

Demand is steady year-round — the busiest month runs 1.3× the quietest.

What does it cost to enter the replacement under-sink water filters niche?

Listings span $6.12–$64.79; the average listing price is $26.09 (sweet spot $15–$100). The average incumbent carries 2,689 reviews — the moat a new listing must climb.

replacement under-sink water filters

Worth a look

Shows low returns (0.9%), but strong incumbent ratings (4.7★) keeps it on the watch list.

Returns

Incredible0.9%

return rate — above 5% kills the launch gate

Avg price

Incredible$26.09

avg listing price — sweet spot $15–$100

Price range

Great$6.12–$64.79

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

Conversion

Great7.3%

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

Competition

Okay56%

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

Brand share

Okay78%

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

Review moat

Okay2,689.32

avg incumbent reviews — the moat a new listing must climb

Growth

Okay+8.6%

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

Market size

Okay$141K

$141K/yr · 74K searches

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

According to Flapen's Amazon United States niche tracking, replacement under-sink water filters is a $141K/yr Amazon United States market (74K searches/yr). The top 5 brands hold 78% of demand. Verdict: Worth a look — 52/100.

Data updated Jul 28, 2026 · scored weekly · How we score niches

replacement under-sink water filters market data

Units sold / yr: 4K–5K; avg 100–250/product
Revenue / yr: $104K–$130K; units × avg price
Conversion rate: 7.3%
Avg BSR: #87
Page quality: 0%
Prime: 100%
Sponsored: 96%
Out of stock: 3.1%
Avg brand age: 81 months
Avg seller age: 143 days

Competition & brand share

The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.

Brands

16 rising

Sellers

Top-5 brand share

78%

Top 20: 100%

Top-5 click share

56%

Top 20: 92%

Open market

17%

Aquaboon26%
PUREPLUS23%
ICEPURE17%
AquaWeaver6%
Membrane Solutions5%
BLUERISE5%
Open — no brand owns it (10 brands, 17%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +8.6% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.3×

Open Trend

Top replacement under-sink water filters search terms

replacement under-sink water filters13K/yr -10.8%0.3% conv.
10x2.5 water filter9K/yr +23.8%5.7% conv.
house water filter replacement5K/yr +112.8%5.6% conv.
10 water filter7K/yr +11.2%4.7% conv.
5 micron filter7K/yr -8.1%2.6% conv.
2.5 x 10 water filter6K/yr +0.7%4.6% conv.
10 inch water filter7K/yr +7.2%4.2% conv.
water filter cartridge 10 inch4K/yr +34.1%4.0% conv.
10 inch water filter cartridge4K/yr +20.6%3.3% conv.
water filter 10 x 2.53K/yr -4.1%6.5% conv.

All search terms

Top replacement under-sink water filters 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

Aquaboon 5 Micron 10 x 2.5 Sediment Filter - Whole House Water Filter Replacement Compatible with Well Water Filters - P5 AP110 WHKF-GD05 6 Pack

Aquaboon$23.324.7★5,541 rev

ICEPURE 1 Micron 2.5 x 10 Whole House CTO Carbon Sediment Water Filter Cartridge Compatible with DuPont WFPFC8002 WFPFC9001 SCWH-5 WHCF-WHWC WHCF-WHWC FXWTC CBC-10 RO Unit Pack of 4

ICEPURE$26.774.6★6,299 rev

1 Micron 2.5 x 10 Whole House CTO Carbon Water Filter Cartridge Replacement for Under Sink Water Filter System Dupont WFPFC8002 WFPFC9001 FXWTC SCWH-5 WHEF-WHWC WHCF-WHWC AMZN-SCWH-5 4Pack

PUREPLUS$26.904.6★7,698 rev

PUREPLUS 5 Micron 10 x 4.5 Whole House Sediment and Carbon Water Filter Replacement Cartridge for GE FXHTC GXWH40L GXWH35F GNWH38S Culligan RFC-BBSA WRC25HD PP10BB-CC Pentek RFC-BB 2Pack

PUREPLUS$28.804.7★7,836 rev

AquaWeaver 5 Micron Sediment Water Filter Cartridge 10 x 2.5 Whole House Filter Replacement Compatible with All Standard 10-Inch RO and Well Water Filter Systems HF-150A WH-S200-C AP11T 6 Pack

AquaWeaver$21.564.8★90 rev

Newest

by launch date

AquaWeaver 5 Micron Sediment Water Filter Cartridge 10 x 2.5 Whole House Filter Replacement Compatible with All Standard 10-Inch RO and Well Water Filter Systems HF-150A WH-S200-C AP11T 6 Pack

AquaWeaver$21.5690 rev

8mo ago

5 Micron 10 x 4.5 Whole House Water Filter Compatible with GE FXHSC

Caehomly$36.7188 rev

10mo ago

Whirlpool 10 x 2.5 Carbon Block Water Filter WHKF-WHCB NSF Certified 5 Micron Reduces Chlorine and Sediment 6-Month Life CTO Replacement Cartridge Fits Home Filter Housing Reverse Osmosis System

Whirlpool$11.8956 rev

10mo ago

20 Micron 10 x 2.5 Pleated Sediment Well Water Filter Cartridge 6 Pack

Locofiltr$33.45116 rev

2y ago

BLUERISE 5 Micron 10 x 2.5 Sediment Water Filter Replacement Cartridge

BLUERISE$19.91211 rev

3y ago

What buyers say about replacement under-sink water filters

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

What buyers love

Filtration32%

“Excellent Filter”

Value For Money17%

“Decent price”

Size-Overall12%

“Fit perfect”

Quality-Overall11%

“Excellent product”

Advertised Vs Actual Product8%

“As advertised”

Efficiency3%

“Does the job”

Assembly/Installation3%

“Easy to install”

Smell2%

“No odors, great value”

Durability1%

“are durable”

Water Resistance1%

“Keeps water clean and clear”

What buyers complain about

Filtration23%

“Worst filters Ive purchased”

Size-Overall11%

“some of them were noticeably too short”

Quality-Overall7%

“Aquaboon filters are poorly made”

Water Resistance7%

“Filters didnt allow water threw”

Durability6%

“Doesnt last”

Leak-Proof4%

“caused a leak”

Jamming/Clogging3%

“Clogged”

Compatibility-Overall3%

“Not compatible :”

Smell3%

“Says it reduces the chlorine smell and taste”

Value For Money2%

“Getting expensive”

Top return reasons

Size-Overall61%

Filtration17%

Compatibility-Overall13%

Advertised Vs Actual Product3%

Value For Money1%

Leak-Proof1%

Functionality-Overall1%

Material Quality1%

Defective Material/Parts0%

Quality-Overall0%

Common questions

Is replacement under-sink water filters profitable to sell on Amazon United States?: The niche generates $141K/yr across 28 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is +8.6%. Flapen's verdict: Worth a look (52/100).
How competitive is the replacement under-sink water filters niche?: 16 brands and 52 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 78% of demand.
What do buyers complain about in replacement under-sink water filters?: Top complaints mined from reviews: Filtration, Size-Overall, Quality-Overall. The return rate is 0.9%.
When does demand for replacement under-sink water filters peak?: Demand is steady year-round — the busiest month runs 1.3× the quietest.
What does it cost to enter the replacement under-sink water filters niche?: Listings span $6.12–$64.79; the average listing price is $26.09 (sweet spot $15–$100). The average incumbent carries 2,689 reviews — the moat a new listing must climb.