Is mustard algae killer profitable to sell on Amazon United States?

The niche generates $236K/yr across 5 tracked products. 90-day search growth is +184.6%. Flapen's verdict: Worth a look (59/100).

How competitive is the mustard algae killer niche?

2 brands and 36 sellers compete. The top 5 products take 100% of clicks and top 5 brands hold 100% of demand.

What do buyers complain about in mustard algae killer?

Top complaints mined from reviews: Functionality-Overall, Contamination, Plant Growth. The return rate is 0.5%.

When does demand for mustard algae killer peak?

Demand peaks in Apr–May–Jun–Jul–Aug; the busiest month runs 11.9× the quietest.

What does it cost to enter the mustard algae killer niche?

Listings span $9.52–$85.03; the average listing price is $39.15 (sweet spot $15–$100). The average incumbent carries 846 reviews — the moat a new listing must climb.

mustard algae killer

Worth a look

Shows searches that convert (18.0% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Conversion

Incredible18.0%

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

Growth

Incredible+184.6%

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

Returns

Incredible0.5%

return rate — above 5% kills the launch gate

Avg price

Incredible$39.15

avg listing price — sweet spot $15–$100

Price range

Great$9.52–$85.03

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

Review moat

Good846.2

avg incumbent reviews — the moat a new listing must climb

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Market size

Okay$236K

$236K/yr · 34K searches

Competition

Bad100%

top-5 click share — a locked-up shelf

Brand share

Bad100%

top-5 brand share — brand-locked demand

Signals Trending

According to Flapen's Amazon United States niche tracking, mustard algae killer is a $236K/yr Amazon United States market (34K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Apr–May–Jun–Jul–Aug. Verdict: Worth a look — 59/100.

Data updated Jul 24, 2026 · scored weekly · How we score niches

mustard algae killer market data

Units sold / yr: 6K–8K; avg 1,250–1,500/product
Revenue / yr: $235K–$313K; units × avg price
Conversion rate: 18.0%
Avg BSR: #79
Page quality: 0%
Prime: 100%
Sponsored: 40%
Out of stock: 0.0%
Avg brand age: 92 months
Avg seller age: 158 days

Competition & brand share

The top 5 products capture 100% of clicks — a locked-up shelf that new listings rarely crack.

Brands

2 falling

Sellers

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

100%

Top 20: 100%

Open market

United Chemical97%
APPLIED BIOCHEMISTS3%

Demand & seasonality

Weekly Amazon search volume, last 102 weeks — +184.6% search growth over the last 90 days.

Peak months: Apr, May, Jun, Jul, Aug · busiest ÷ quietest = 11.9×

Open Trend

Top mustard algae killer search terms

yellow treat algaecide19K/yr +188.8%19.0% conv.
yellow treat12K/yr +119.5%17.6% conv.
yellow treat algaecide for swimming pool3K/yr +520.6%16.5% conv.

All search terms

Top mustard algae killer 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 5 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

United Chemicals Yellow Treat Mustard Algaecide for Swimming Pool Super Strength Algae Killer for Mustard & Yellow Algae in Saltwater & Chlorine Above & Inground Pool Treatment | YT2-2LB

United Chemical$24.514.3★2,032 rev

United Chemicals YellowTreat Mustard Algaecide for Swimming Pool Super Strength Algae Killer for Mustard & Yellow Algae in Saltwater & Chlorine Above & Inground Pool Treatment | YT2-2LB-C2

United Chemical$41.714.5★1,195 rev

United Chemical Yellow Treat Mustard Algaecide 5 oz

United Chemical$9.524.3★408 rev

United Chemicals Yellow Treat 2 lb - YT-C12 - 4 PACK

United Chemical$85.034.6★157 rev

Applied Biochemists Pool 408622A Yellowtrine Swimming Pool Algaecide Cleanser 3 lbs

APPLIED BIOCHEMISTS$34.994.3★439 rev

Newest

by launch date

United Chemicals Yellow Treat 2 lb - YT-C12 - 4 PACK

United Chemical$85.03157 rev

8y ago

United Chemical Yellow Treat Mustard Algaecide 5 oz

United Chemical$9.52408 rev

11y ago

United Chemicals YellowTreat Mustard Algaecide for Swimming Pool Super Strength Algae Killer for Mustard & Yellow Algae in Saltwater & Chlorine Above & Inground Pool Treatment | YT2-2LB-C2

United Chemical$41.711,195 rev

12y ago

Applied Biochemists Pool 408622A Yellowtrine Swimming Pool Algaecide Cleanser 3 lbs

APPLIED BIOCHEMISTS$34.99439 rev

15y ago

United Chemicals Yellow Treat Mustard Algaecide for Swimming Pool Super Strength Algae Killer for Mustard & Yellow Algae in Saltwater & Chlorine Above & Inground Pool Treatment | YT2-2LB

United Chemical$24.512,032 rev

16y ago

What buyers say about mustard algae killer

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

What buyers love

Value For Money22%

“easy ordering and good pricing”

Quality-Overall15%

“Excellent product”

Instructions/User Manual/Troubleshooting15%

“Easy to follow instructions”

Water Resistance8%

“Water is crystal clear just a day after application”

Ease Of Cleaning7%

“This algaecide works really well for keeping my pool clean and algae-free”

Ease Of Use6%

“Easy to use”

Strength5%

“Effective”

Eco Friendliness5%

“The pool is high maintenance due to the environment”

Plant Growth5%

“it seems to help with algae blooms”

Brightness/Shine/Glow5%

“Perfect for keeping your pool a sparkling blue all season long”

What buyers complain about

Functionality-Overall42%

“Didnt work”

Contamination25%

“I was having a problem with mustard algae appearing on the walls of my in-ground plaster pool with a DE filtration system”

Plant Growth8%

“I did end up having to buy 4 total bottles to get the mustard algae bloom beaten back”

Maintenance And Repair8%

“This wasn't a permanent fix”

Advertised Vs Actual Product8%

“Deceptive advertisement”

Value For Money8%

“I did find a product at Home Depot that does about the same for a cheaper price”

Top return reasons

Advertised Vs Actual Product34%

Functionality-Overall21%

Leak-Proof14%

Suitable For Outdoor5%

Value For Money5%

Product Condition4%

Contamination3%

Size-Overall3%

Instructions/User Manual/Troubleshooting2%

Water Resistance2%

Common questions

Is mustard algae killer profitable to sell on Amazon United States?: The niche generates $236K/yr across 5 tracked products. 90-day search growth is +184.6%. Flapen's verdict: Worth a look (59/100).
How competitive is the mustard algae killer niche?: 2 brands and 36 sellers compete. The top 5 products take 100% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in mustard algae killer?: Top complaints mined from reviews: Functionality-Overall, Contamination, Plant Growth. The return rate is 0.5%.
When does demand for mustard algae killer peak?: Demand peaks in Apr–May–Jun–Jul–Aug; the busiest month runs 11.9× the quietest.
What does it cost to enter the mustard algae killer niche?: Listings span $9.52–$85.03; the average listing price is $39.15 (sweet spot $15–$100). The average incumbent carries 846 reviews — the moat a new listing must climb.