Is di filter profitable to sell on Amazon United States?

The niche generates $115K/yr across 26 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is -3.4%. Flapen's verdict: Skip it (47/100).

How competitive is the di filter niche?

7 brands and 16 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 97% of demand.

What do buyers complain about in di filter?

Top complaints mined from reviews: Filtration, Leak-Proof, Quality-Overall. The return rate is 2.4%.

What does it cost to enter the di filter niche?

Listings span $7.49–$151.98; the average listing price is $47.82 (sweet spot $15–$100). The average incumbent carries 749 reviews — the moat a new listing must climb.

di filter

Skip it

Brand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.

Avg price

Great$47.82

avg listing price — sweet spot $15–$100

Conversion

Great8.2%

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

Review moat

Good748.58

avg incumbent reviews — the moat a new listing must climb

Returns

Good2.4%

return rate — above 6% kills the launch gate

Price range

Good$7.49–$151.98

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

Competition

Good52%

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

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Market size

Okay$115K

$115K/yr · 29K searches

Growth

Bad-3.4%

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

Brand share

Bad97%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, di filter is a $115K/yr Amazon United States market (29K searches/yr). The top 5 brands hold 97% of demand. Verdict: Skip it — 47/100.

Data updated Jul 17, 2026 · scored weekly · How we score niches

di filter market data

Units sold / yr: 2K–3K; avg 0–100/product
Revenue / yr: $96K–$120K; units × avg price
Launch success: —; 0 of 2 new (360d)
Conversion rate: 8.2%
Avg BSR: #808
Page quality: 0%
Prime: 100%
Sponsored: 50%
Out of stock: 4.5%
Avg brand age: 81 months
Avg seller age: 181 days

Competition & brand share

The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.

Brands

7 falling

Sellers

Top-5 brand share

97%

Top 20: 100%

Top-5 click share

52%

Top 20: 92%

Open market

Aquatic Life81%
FilterFutureX7%
Ceoighe6%
Membrane Solutions2%
MOPUEHEL2%
SimPure2%
Open — no brand owns it (1 brand, 1%)

Demand

Weekly Amazon search volume, last 37 weeks — -3.4% search growth over the last 90 days.

Open Trend

Top di filter search terms

di filter8K/yr +14.5%1.5% conv.
aquatic life replacement filters8K/yr -12.1%6.8% conv.
di resin cartridge4K/yr -0.6%3.8% conv.
ro buddy replacement filters4K/yr -22.4%12.2% conv.
aquatic life3K/yr -10.4%2.3% conv.
ro buddie replacement filters3K/yr +0.0%13.0% conv.

All search terms

Top di filter 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 26 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Aquatic Life RO Buddie Aquarium Filter Replacement Cartridge Set 3 Pack (Sediment Carbon Color-Changing DI Resin) Inline Cartridges for Clear Safe Aquarium Water

Aquatic Life$36.494.7★1,031 rev

Aquatic Life RO Buddie 4-Stage Aquarium Water Filter System Reverse Osmosis RO/DI Filtration Unit for Fish Tank Fountains and More 50 GPD (Gallons Per Day)

Aquatic Life$68.854.5★5,036 rev

Aquatic Life Twist-In Reverse Osmosis Aquarium Water Filter Replacement Cartridge Pack Includes 75 GPD Membrane Sediment Carbon Block and Deionization DI Filters for 3 and 4-Stage RO/DI System

Aquatic Life$74.324.7★391 rev

Aquatic Life DI Color Changing Mixed Bed Resin Cartridge Aquarium Hydroponics

Aquatic Life$22.574.6★1,424 rev

Ceoighe 3 Pack Aquarium Filter Replacement Cartridge Set Compatible with AquaticLife RO Buddie Inline Cartridges for Clear Include Sediment Carbon Block Color Changing DI Resin and Quick Couplings

Ceoighe$29.825.0★2 rev

Newest

by launch date

Ceoighe 3 Pack Aquarium Filter Replacement Cartridge Set Compatible with AquaticLife RO Buddie Inline Cartridges for Clear Include Sediment Carbon Block Color Changing DI Resin and Quick Couplings

Ceoighe$29.822 rev

5mo ago

Ceoighe RO Replacement Cartridges Set (3-Pack) Compatible with AquaticLife RO Buddie Replacement Filters Include Carbon Block Filter Sediment Cartridge & 100GPD Membrane for Most RODI Systems

Ceoighe$35.743 rev

5mo ago

Refillable Mixed Bed DI Resin Filter Color Changing Deionized Resin 10-Inch Replacement Cartridge Car Wash Window Cleaning Aquarium (2 packs)

FilterFutureX$35.5227 rev

1y ago

Di Filter Color Changing Mixed Bed Ion Exchange Resin Deionization DI Aquarium Filter Reduce TDS (2 Packs)

FilterFutureX$28.3416 rev

1y ago

Aquatic Life Color Changing Deionization DI Resin for Hydroponic Reverse Osmosis Water Filter System RO Filtration Unit Single Canister

Aquatic Life$39.1427 rev

2y ago

What buyers say about di filter

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

What buyers love

Value For Money14%

“Great value”

Filtration12%

“Excellent Water Filtration System”

Quality-Overall10%

“they look well-made”

Advertised Vs Actual Product10%

“Just as described”

Size-Overall8%

“Direct fit”

Leak-Proof5%

“The canister didn't have any leaks”

Ease Of Use4%

“Easy to use”

Assembly/Installation4%

“Easy install”

Ease Of Cleaning3%

“As long as its consistent giving you clean water”

Efficiency3%

“Works well”

What buyers complain about

Filtration18%

“filter exhausted early”

Leak-Proof16%

“Leaks”

Quality-Overall9%

“Very Poor Quality”

Value For Money7%

“Wish these were cheaper”

Durability5%

“Doesnt last long at all”

Functionality-Overall5%

“still won't come out”

Spray/Flow3%

“the flow is not there at all”

Connectivity-Overall3%

“O-ring connections disappointing”

Ease Of Use3%

“hard to get out”

Natural Resource Wastage3%

“wastes a ton of water”

Top return reasons

Size-Overall28%

Filtration22%

Compatibility-Overall9%

Leak-Proof7%

Functionality-Overall7%

Advertised Vs Actual Product5%

Defective Material/Parts3%

Value For Money3%

Product Condition3%

Assembly/Installation2%

Common questions

Is di filter profitable to sell on Amazon United States?: The niche generates $115K/yr across 26 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is -3.4%. Flapen's verdict: Skip it (47/100).
How competitive is the di filter niche?: 7 brands and 16 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 97% of demand.
What do buyers complain about in di filter?: Top complaints mined from reviews: Filtration, Leak-Proof, Quality-Overall. The return rate is 2.4%.
What does it cost to enter the di filter niche?: Listings span $7.49–$151.98; the average listing price is $47.82 (sweet spot $15–$100). The average incumbent carries 749 reviews — the moat a new listing must climb.