---
title: "Di Filter — $115K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/pet-supplies/di-filter"
last_updated: "2026-07-21T17:37:38.024Z"
locale: en
meta:
description: "Niche score 47/100 · $115K/yr market · 29K searches/yr · $47.82 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 47/100 · $115K/yr market · 29K searches/yr · $47.82 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Di Filter — $115K/yr Amazon US Niche (2026) - Flapen"
---
# **di filter**
**Skip it**
Brand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.
Market size 27Growth 23Conversion 80Competition 55Returns 65Price range 59Avg price 94Brand share 7Review moat 69Quality gap 53
**Avg price**
**Great****$47.82**
avg listing price — sweet spot $15–$100
**Conversion**
**Great****8.2%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Good****748.58**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Good****2.4%**
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**
**Good****52%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Good****4.4★**
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**
**Bad****97%**
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 ~~](https://flapen.com/research/methodology)
## **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**
**16**
**Top-5 brand share**
**97%**
Top 20: 100%
**Top-5 click share**
**52%**
Top 20: 92%
**Open market**
**1%**
- 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.
600400Spike '26Nov '25Dec '25Jan '26Mar '26Apr '26May '26
[**Open Trend **](https://flapen.com/research/us/pet-supplies/di-filter/trend)
## **Top di filter search terms**
- **di filter**8K/yr+14.5%1.5% conv. - **aquatic life replacement filters**8K/yr-12.1%6.8% conv. - **di resin cartridge**4K/yr-0.6%3.8% conv. - **ro buddy replacement filters**4K/yr-22.4%12.2% conv. - **aquatic life**3K/yr-10.4%2.3% conv. - **ro buddie replacement filters**3K/yr+0.0%13.0% conv. [**All search terms **](https://flapen.com/research/us/pet-supplies/di-filter/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.
0%10%$11K20%$23K30%$34K40%$46K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**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**$36.49**4.7★1,031 rev](https://www.amazon.com/dp/B08HC2JRZR) [2**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**$68.85**4.5★5,036 rev](https://www.amazon.com/dp/B00204CQF6) [3**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**$74.32**4.7★391 rev](https://www.amazon.com/dp/B088TT5VNC) [4**Aquatic Life DI Color Changing Mixed Bed Resin Cartridge Aquarium Hydroponics**Aquatic Life**$22.57**4.6★1,424 rev](https://www.amazon.com/dp/B00DSP57BQ) [5**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**$29.82**5.0★2 rev](https://www.amazon.com/dp/B0GK18TPS4)
**~~View all top sellers →~~**
### **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**$29.82**2 rev5mo ago](https://www.amazon.com/dp/B0GK18TPS4) [**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**$35.74**3 rev5mo ago](https://www.amazon.com/dp/B0GK172RJY) [**Refillable Mixed Bed DI Resin Filter Color Changing Deionized Resin 10-Inch Replacement Cartridge Car Wash Window Cleaning Aquarium (2 packs)**FilterFutureX**$35.52**27 rev1y ago](https://www.amazon.com/dp/B0FDKN4996) [**Di Filter Color Changing Mixed Bed Ion Exchange Resin Deionization DI Aquarium Filter Reduce TDS (2 Packs)**FilterFutureX**$28.34**16 rev1y ago](https://www.amazon.com/dp/B0FCXY35F7) [**Aquatic Life Color Changing Deionization DI Resin for Hydroponic Reverse Osmosis Water Filter System RO Filtration Unit Single Canister**Aquatic Life**$39.14**27 rev2y ago](https://www.amazon.com/dp/B0CZVMYD9G)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**$35.74**2.7★**▲ 327%**](https://www.amazon.com/dp/B0GK172RJY) [**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**$29.82**5.0★**▲ 233%**](https://www.amazon.com/dp/B0GK18TPS4) [**Max Water 2 Stage Deionized Spot Free Car Rinse Unit Premium Water Deionizer for Spotless Car Wash Water System RV and Motorcycle No Towel Drying - 2 DI Filters with 45-80 PSI & 3/4 Inlet/Outlet**Max Water**$102.88**3.4★**▲ 53%**](https://www.amazon.com/dp/B096L1H2D4) [**Aquatic Life 4-Stage Reverse Osmosis Deionization Water Filter System RO/DI Filtration Unit with Carbon Plus Cartridge 100 GPD**Aquatic Life**$151.98**4.3★**▲ 46%**](https://www.amazon.com/dp/B09MTS1BCM) [**SimPure Whole House Water Filter Housing (DB10P) 10 x 4.5 Sediment Carbon Filter Universal Housing Pre-Filtration System for Well and City Water 1 NPT Port Pressure Release**SimPure**$46.69**4.4★**▲ 42%**](https://www.amazon.com/dp/B086WRLZPY)
**~~View all trending →~~**
## **What buyers say about di filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Value For Money**14%
*“Great value”*
**Filtration**12%
*“Excellent Water Filtration System”*
**Quality-Overall**10%
*“they look well-made”*
**Advertised Vs Actual Product**10%
*“Just as described”*
**Size-Overall**8%
*“Direct fit”*
**Leak-Proof**5%
*“The canister didn't have any leaks”*
**Ease Of Use**4%
*“Easy to use”*
**Assembly/Installation**4%
*“Easy install”*
**Ease Of Cleaning**3%
*“As long as its consistent giving you clean water”*
**Efficiency**3%
*“Works well”*
### **What buyers complain about **
**Filtration**18%
*“filter exhausted early”*
**Leak-Proof**16%
*“Leaks”*
**Quality-Overall**9%
*“Very Poor Quality”*
**Value For Money**7%
*“Wish these were cheaper”*
**Durability**5%
*“Doesnt last long at all”*
**Functionality-Overall**5%
*“still won't come out”*
**Spray/Flow**3%
*“the flow is not there at all”*
**Connectivity-Overall**3%
*“O-ring connections disappointing”*
**Ease Of Use**3%
*“hard to get out”*
**Natural Resource Wastage**3%
*“wastes a ton of water”*
### **Top return reasons **
**Size-Overall**28%
**Filtration**22%
**Compatibility-Overall**9%
**Leak-Proof**7%
**Functionality-Overall**7%
**Advertised Vs Actual Product**5%
**Defective Material/Parts**3%
**Value For Money**3%
**Product Condition**3%
**Assembly/Installation**2%
## **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.
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