Is scum balls for hot tub profitable to sell on Amazon United States?

The niche generates $99K/yr across 23 tracked products. 2 of 6 products launched in the last 360 days are still selling. 90-day search growth is +79.9%. Flapen's verdict: Worth a look (68/100).

How competitive is the scum balls for hot tub niche?

20 brands and 43 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 59% of demand.

What do buyers complain about in scum balls for hot tub?

Top complaints mined from reviews: Functionality-Overall, Durability, Color. The return rate is 0.4%.

When does demand for scum balls for hot tub peak?

Demand peaks in Jun–Jul–Aug; the busiest month runs 2.7× the quietest.

What does it cost to enter the scum balls for hot tub niche?

Listings span $7.48–$25.52; the average listing price is $13.74 (sweet spot $15–$100). The average incumbent carries 794 reviews — the moat a new listing must climb.

scum balls for hot tub

Worth a look

Shows low returns (0.4%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Returns

Incredible0.4%

return rate — above 5% kills the launch gate

Conversion

Incredible15.0%

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

Quality gap

Great4.2★

avg incumbent rating — lower means beatable quality

Growth

Great+79.9%

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

Brand share

Great59%

top-5 brand share — no brand owns this niche

Review moat

Good794.17

avg incumbent reviews — the moat a new listing must climb

Avg price

Good$13.74

avg listing price — sweet spot $15–$100

Price range

Good$7.48–$25.52

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

Competition

Okay56%

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

Market size

Bad$99K

$99K/yr · 48K searches

Signals Low Review Barrier

According to Flapen's Amazon United States niche tracking, scum balls for hot tub is a $99K/yr Amazon United States market (48K searches/yr). The top 5 brands hold 59% of demand. Demand peaks in Jun–Jul–Aug. Verdict: Worth a look — 68/100.

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

scum balls for hot tub market data

Units sold / yr: 8K–10K; avg 250–500/product
Revenue / yr: $110K–$137K; units × avg price
Conversion rate: 15.0%
Avg BSR: #252
Page quality: 0%
Prime: 100%
Sponsored: 91%
Out of stock: 9.1%
Avg brand age: 32 months
Avg seller age: 173 days

Competition & brand share

The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.

Brands

20 rising

Sellers

Top-5 brand share

59%

Top 20: 100%

Top-5 click share

56%

Top 20: 97%

Open market

35%

kaifansun21%
SCUMBALL14%
JRQHF9%
Gerrii8%
MTWEAR7%
Rola-Chem6%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +79.9% search growth over the last 90 days.

Peak months: Jun, Jul, Aug · busiest ÷ quietest = 2.7×

Open Trend

Top scum balls for hot tub search terms

scum balls for spas hot tub24K/yr +42.9%16.1% conv.
scum balls for pool8K/yr +808.9%11.3% conv.
pool scum balls3K/yr +534.8%11.8% conv.
hot tub scum balls5K/yr +27.2%16.5% conv.
scum balls4K/yr +86.7%16.2% conv.
scumball for hot tub4K/yr -51.7%14.2% conv.

All search terms

Top scum balls for hot tub 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 23 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

4 Pack Scum Absorber Balls for Spas Hot Tub 3 Inch Hot Tub Scum Absorber Ball Reusable Pool Sponge Oil Scum Absorber Hot Tub Spa Accessories Keep Water Clean and Clear Prolongs Filter Life

kaifansun$10.394.2★158 rev

Scumballs for Hot Tub Scum Absorber & Pool Spa Surface Cleaner | Reusable 3-inch Foam Ball Absorbs Oils hot tub Sponge scum Absorber | Hot Tub Accessories Prevents Scum Lines & Filter Clogs | 4 Pack

SCUMBALL$23.264.5★1,224 rev

JRQHF Absorber Balls of Scum for Spas Hot Tub Reusable 3 Inch Hot Tub Absorber Ball of Scum Washable Hot Tub Oil Spa Absorber Ball of Scum Spa Sponge Balls for Scum Removal White 4 Pack

JRQHF$9.474.4★214 rev

Gerrii 12 Pack Hot Tub Scum Absorber Ball 3 Inch Reusable Pool Sponge Oil Scum Washable Absorber for Pool Spas Keep Water Clean Floating Removal Filter

Gerrii$17.674.3★237 rev

MTWEAR Hot Tub Scum Absorber 6 Pack Spa & Pool Scum Eliminating Balls hot tub scum Balls Scum Sponge for Spa Hot Tub Hot Tub Accessories Oil Absorbing Sponge for Hot Tub Skimmer

MTWEAR$18.664.1★114 rev

Newest

by launch date

ASIJUNTYECHO Scum Balls for Spas Hot Tub Pool Sponge Oil Absorber Ball Reusable Washable Scum Remover Swimming Pool Accessories 4 Pack

ASIJUNTYECHO$8.043 rev

5mo ago

DONJOP 6 Inches Hot Tub Scum Absorber Hot Tub Sponge for Scum Reusable Spa & Pool Cleaner Hot Tub Oil Absorbing Scum Absorber Keeps Water Clean Eliminates Scum & Dirt Blue 2 Pack

DONJOP$20.5191 rev

6mo ago

Matwsec 4 Pack Scum Balls for Spas Hot Tub 3 Inch Pool Sponge Oil Absorber

Matwsec$8.1716 rev

7mo ago

6 Pack Scum Absorber Balls for Spas Hot Tub 3 Inch Hot Tub Scum Absorber Ball Reusable Pool Sponge Oil Scum Absorber Hot Tub Spa Accessories Keep Water Clean and Clear Prolongs Filter Life

kaifansun$12.99158 rev

8mo ago

4 Pack Scum Absorber Balls for Spas Hot Tub Reusable 3 Inch Hot Tub Absorber Ball of Scum Washable Hot Tub Oil Spa Absorber Ball of Scum Spa Sponge Balls for Scum Removal Hot Tub Spa Accessories

RAXICHET$9.018 rev

9mo ago

What buyers say about scum balls for hot tub

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

What buyers love

Ease Of Cleaning18%

“Easy clean”

Value For Money18%

“Good value”

Quality-Overall13%

“Decent item”

Advertised Vs Actual Product10%

“As advertised”

Ease Of Use8%

“Easy to use”

Absorbency5%

“They absorb so well”

Water Resistance3%

“Water is clear”

Size-Overall3%

“Good size”

Heating3%

“Great for our hot tub”

Design-Overall3%

“Especially their many designs”

What buyers complain about

Functionality-Overall19%

“Not effective”

Durability15%

“Break down and fall apart”

Color10%

“assume that's why the color leached out”

Quality-Overall7%

“Trash”

Value For Money6%

“Not worth. the very cheap”

Adhesion/Stickiness6%

“they dont stick”

Shape/Style5%

“Not even spherical”

Size-Overall4%

“NOT FIT FOR PURPOSE”

Advertised Vs Actual Product3%

“The images for this product are deceptive”

Water Resistance3%

“These should float on the water”

Top return reasons

Size-Overall17%

Functionality-Overall17%

Absorbency10%

Defective Material/Parts8%

Advertised Vs Actual Product7%

Shape/Style6%

Filtration5%

Adhesion/Stickiness5%

Quality-Overall5%

Value For Money4%

Common questions

Is scum balls for hot tub profitable to sell on Amazon United States?: The niche generates $99K/yr across 23 tracked products. 2 of 6 products launched in the last 360 days are still selling. 90-day search growth is +79.9%. Flapen's verdict: Worth a look (68/100).
How competitive is the scum balls for hot tub niche?: 20 brands and 43 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 59% of demand.
What do buyers complain about in scum balls for hot tub?: Top complaints mined from reviews: Functionality-Overall, Durability, Color. The return rate is 0.4%.
When does demand for scum balls for hot tub peak?: Demand peaks in Jun–Jul–Aug; the busiest month runs 2.7× the quietest.
What does it cost to enter the scum balls for hot tub niche?: Listings span $7.48–$25.52; the average listing price is $13.74 (sweet spot $15–$100). The average incumbent carries 794 reviews — the moat a new listing must climb.