Is water clarifier for fish tank profitable to sell on Amazon United States?

The niche generates $932K/yr across 13 tracked products. 90-day search growth is -10.2%. Flapen's verdict: Worth a look (54/100).

How competitive is the water clarifier for fish tank niche?

6 brands and 53 sellers compete. The top 5 products take 74% of clicks and top 5 brands hold 98% of demand.

When does demand for water clarifier for fish tank peak?

Demand is steady year-round — the busiest month runs 1.5× the quietest.

What does it cost to enter the water clarifier for fish tank niche?

Listings span $5.55–$65.35; the average listing price is $26.07 (sweet spot $15–$100). The average incumbent carries 6,524 reviews — the moat a new listing must climb.

water clarifier for fish tank

Worth a look

Shows searches that convert (14.5% search→purchase), but brand-locked demand (top 5 brands take 98% of clicks) keeps it on the watch list.

Conversion

Incredible14.5%

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

Returns

Incredible1.0%

return rate — above 6% kills the launch gate

Avg price

Incredible$26.07

avg listing price — sweet spot $15–$100

Price range

Great$5.55–$65.35

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

Market size

Great$932K

$932K/yr · 247K searches

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Review moat

Bad6,523.62

avg incumbent reviews — the moat a new listing must climb

Competition

Bad74%

top-5 click share — a locked-up shelf

Growth

Bad-10.2%

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

Brand share

Bad98%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, water clarifier for fish tank is a $932K/yr Amazon United States market (247K searches/yr). The top 5 brands hold 98% of demand. Verdict: Worth a look — 54/100.

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

water clarifier for fish tank market data

Units sold / yr: 30K–40K; avg 2,000–2,500/product
Revenue / yr: $782K–$1.0M; units × avg price
Launch success: —; 0 of 0 new (360d)
Conversion rate: 14.5%
Avg BSR: #58
Page quality: 0%
Prime: 100%
Sponsored: 92%
Out of stock: 5.6%
Avg brand age: 66 months
Avg seller age: 152 days

Competition & brand share

The top 5 products capture 74% of clicks — a locked-up shelf that new listings rarely crack.

Brands

6 falling

Sellers

Top-5 brand share

98%

Top 20: 100%

Top-5 click share

74%

Top 20: 100%

Open market

API58%
Fluval19%
Aqueon10%
Aquatic Experts8%
Tetra3%
MICROBE-LIFT2%
Open — no brand owns it (0%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -10.2% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.5×

Open Trend

Top water clarifier for fish tank search terms

water clarifier for fish tank35K/yr -5.1%10.9% conv.
aquarium water clarifier27K/yr -2.0%11.1% conv.
aquaclear23K/yr +6.5%3.0% conv.
fish tank water clarifier19K/yr -7.6%11.3% conv.
aquaclear filter26K/yr -42.6%2.3% conv.
accu clear12K/yr +37.1%21.2% conv.
cloudy fish tank water fix20K/yr -54.0%7.4% conv.
api accu clear8K/yr +19.6%21.2% conv.
aquarium clear cloudy water6K/yr +38.6%10.2% conv.
fish tank clear cloudy water8K/yr -6.8%12.6% conv.

All search terms

Top water clarifier for fish tank 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 13 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

API ACCU-CLEAR Freshwater Aquarium Water Clarifier 8-Ounce Bottle

API$9.334.6★20,098 rev

API ACCU-CLEAR Freshwater Aquarium Water Clarifier 4-Ounce Bottle

API$5.554.6★20,098 rev

Aqueon Freshwater Aquarium Water Clarifier Clears Cloudy Fish Tank Water Safe to Use with Fish and Plants - 8 Ounces

Aqueon$7.264.5★5,602 rev

KloudAway Freshwater Aquarium Water Clarifier - Clears Cloudy Water Water Clarifier for Fish Tank Made in USA Aquatic Experts (500 ml)

Aquatic Experts$17.334.4★2,497 rev

AC20 Power Filter 5-20 US Gal / 18-76 L - Fluval USA (fluvalaquatics.com)

Fluval$34.784.4★636 rev

Newest

by launch date

AC20 Power Filter 5-20 US Gal / 18-76 L - Fluval USA (fluvalaquatics.com)

Fluval$34.78636 rev

1y ago

AC50 Power Filter 20-50 US Gal / 76-190 L - Fluval USA (fluvalaquatics.com)

Fluval$51.47363 rev

1y ago

KloudAway Freshwater Aquarium Water Clarifier - Clears Cloudy Water Water Clarifier for Fish Tank Made in USA Aquatic Experts (500 ml)

Aquatic Experts$17.332,497 rev

7y ago

MICROBE-LIFT Special Blend Aquarium Water Care Treatment Cleaner & Clarifier for Fresh and Saltwater Fish Tanks Reduces Maintenance & Helps with Aquarium Algae Control and Odor 4 Ounces (SBH04)

MICROBE-LIFT$9.021,446 rev

18y ago

Aqueon Freshwater Aquarium Water Clarifier Clears Cloudy Fish Tank Water Safe to Use with Fish and Plants - 8 Ounces

Aqueon$7.265,602 rev

19y ago

Common questions

Is water clarifier for fish tank profitable to sell on Amazon United States?: The niche generates $932K/yr across 13 tracked products. 90-day search growth is -10.2%. Flapen's verdict: Worth a look (54/100).
How competitive is the water clarifier for fish tank niche?: 6 brands and 53 sellers compete. The top 5 products take 74% of clicks and top 5 brands hold 98% of demand.
When does demand for water clarifier for fish tank peak?: Demand is steady year-round — the busiest month runs 1.5× the quietest.
What does it cost to enter the water clarifier for fish tank niche?: Listings span $5.55–$65.35; the average listing price is $26.07 (sweet spot $15–$100). The average incumbent carries 6,524 reviews — the moat a new listing must climb.