black algae killer for pools
Worth a lookShows demand growing +309.2% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Growth
Incredible+309.2%90-day search growth — must beat 0% to launch
Returns
Incredible0.3%return rate — above 5% kills the launch gate
Conversion
Incredible12.3%search→purchase rate — share of searches ending in a sale
Avg price
Incredible$42.68avg listing price — sweet spot $15–$100
Price range
Incredible$14.88–$74.06cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Great4.3★avg incumbent rating — lower means beatable quality
Market size
Good$411K$411K/yr · 78K searches
Review moat
Okay2,590.92avg incumbent reviews — the moat a new listing must climb
Brand share
Okay89%top-5 brand share — brands hold most of the demand
Competition
Okay69%top-5 click share — leaders hold, buyers still browse
According to Flapen's Amazon United States niche tracking, black algae killer for pools is a $411K/yr Amazon United States market (78K searches/yr). The top 5 brands hold 89% of demand. Demand peaks in May–Jun–Jul–Aug–Sep. Verdict: Worth a look — 68/100.
Data updated Jul 24, 2026 · scored weekly · How we score niches
black algae killer for pools market data
- Units sold / yr
- 8K–10K
- avg 500–750/product
- Revenue / yr
- $341K–$427K
- units × avg price
- Conversion rate
- 12.3%
- Avg BSR
- #22
- Page quality
- 0%
- Prime
- 85%
- Sponsored
- 100%
- Out of stock
- 0.0%
- Avg brand age
- 107 months
- Avg seller age
- 154 days
Competition & brand share
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.Brands
8 falling
Sellers
73
Top-5 brand share
89%
Top 20: 100%
Top-5 click share
69%
Top 20: 100%
Open market
6%
- Pool Mate34%
- MAV AquaDoc24%
- In The Swim20%
- poolrx6%
- CLOROX Pool&Spa6%
- APPLIED BIOCHEMISTS5%
- Open — no brand owns it (2 brands, 6%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +309.2% search growth over the last 90 days.Peak months: May, Jun, Jul, Aug, Sep · busiest ÷ quietest = 18.4×
Top black algae killer for pools search terms
- black algae killer for pools40K/yr
- black algaecide for swimming pool10K/yr
- black algae eliminator3K/yr
- black algaecide5K/yr
- black algae destroyer4K/yr
- black algae killer3K/yr
- pool black algae killer4K/yr
- black algae treatment3K/yr
- black algae2K/yr
- black algae pool treatment3K/yr
Top black algae killer for pools 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.
All 13 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Pool Mate 1-Quart Concentrated Black Algaecide Algaecide for Pool Made in USA
Pool Mate$31.424.2★115 rev
In The Swim Black Algaecide Eradicates Black Algae in Swimming Pools - Copper Sulfate Pentahydrate - 1 Quart
In The Swim$24.864.2★779 rev
AquaDoc Copper Pool Algaecide for Swimming Pools - 32 oz - 90 Day Algaecide for Inground & Above Ground Pools - Non-Foaming Non-Staining Formula Reduces Chlorine Demand
MAV AquaDoc$29.094.2★1,291 rev
PoolRx Pool Unit #101066 6 Month Algaecide Treats 20k-30k gallons Black
poolrx$66.314.5★7,500 rev
Clorox Pool&Spa Swimming Pool Algaecide and Clarifier Prevents and Treats Pool Algae Clears Water 128 Fl Oz (Pack of 1)
CLOROX Pool&Spa$14.884.5★15,560 rev
Newest
by launch date
AquaDoc Algae Smash Polyquat 60 Algaecide for Swimming Pools - 32 oz - Non-Foaming Non-Staining Formula to Help Remove and Prevent Algae in Inground and Above Ground Pools - Made in USA
MAV AquaDoc$36.6885 rev
AquaDoc Copper Pool Algaecide for Swimming Pools - 128 oz - 90 Day Algaecide for Inground & Above Ground Pools - Non-Foaming Non-Staining Formula Reduces Chlorine Demand
MAV AquaDoc$74.061,291 rev
AquaDoc Copper Pool Algaecide for Swimming Pools - 64 oz - 90 Day Algaecide for Inground & Above Ground Pools - Non-Foaming Non-Staining Formula Reduces Chlorine Demand
MAV AquaDoc$60.421,291 rev
In The Swim Black Algaecide Eradicates Black Algae in Swimming Pools - Copper Sulfate Pentahydrate - 1 Quart - 2 Pack
In The Swim$44.92779 rev
HTH 67244 Swimming Pool Care Algae Guard Ultra - Long Lasting Formula Eliminates & Prevents Green Black and Mustard Algae Fast Acting & Effective Swimming Pool Chemical 32oz
HTH$27.99213 rev
Trending
90-day click momentumAquaDoc Algae Smash Polyquat 60 Algaecide for Swimming Pools - 32 oz - Non-Foaming Non-Staining Formula to Help Remove and Prevent Algae in Inground and Above Ground Pools - Made in USA
MAV AquaDoc$36.684.2★
HTH 67244 Swimming Pool Care Algae Guard Ultra - Long Lasting Formula Eliminates & Prevents Green Black and Mustard Algae Fast Acting & Effective Swimming Pool Chemical 32oz
HTH$27.994.5★
In The Swim Black Algaecide Eradicates Black Algae in Swimming Pools - Copper Sulfate Pentahydrate - 1 Quart - 2 Pack
In The Swim$44.924.2★
AquaDoc Copper Pool Algaecide for Swimming Pools - 32 oz - 90 Day Algaecide for Inground & Above Ground Pools - Non-Foaming Non-Staining Formula Reduces Chlorine Demand
MAV AquaDoc$29.094.2★
Pool Mate 1-Quart Concentrated Black Algaecide Algaecide for Pool Made in USA
Pool Mate$31.424.2★
What buyers say about black algae killer for pools
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent Product”
“Great value”
“Performed as advertised”
“Easy to use”
“Clean & Clear”
“this restored my pool to blue and clear again”
“keeps the water looking clean”
“Also the blue color is super cool :”
“it was very durable”
“Super easy to use with clear instructions”
What buyers complain about
“It never worked”
“way overpriced”
“Using this will kill the algae”
“Garbage”
“False advertisement”
“Still green”
“Water not cleared”
“Don't keep clean”
“it has no odor”
“is leaking the product”
Top return reasons
Common questions
- Is black algae killer for pools profitable to sell on Amazon United States?
- The niche generates $411K/yr across 13 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +309.2%. Flapen's verdict: Worth a look (68/100).
- How competitive is the black algae killer for pools niche?
- 8 brands and 73 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 89% of demand.
- What do buyers complain about in black algae killer for pools?
- Top complaints mined from reviews: Functionality-Overall, Value For Money, Contamination. The return rate is 0.3%.
- When does demand for black algae killer for pools peak?
- Demand peaks in May–Jun–Jul–Aug–Sep; the busiest month runs 18.4× the quietest.
- What does it cost to enter the black algae killer for pools niche?
- Listings span $14.88–$74.06; the average listing price is $42.68 (sweet spot $15–$100). The average incumbent carries 2,591 reviews — the moat a new listing must climb.