---
title: "Scum Balls for Hot Tub — $99K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/scum-balls-for-hot-tub"
last_updated: "2026-08-05T21:17:24.334Z"
locale: en
meta:
description: "Niche score 68/100 · $99K/yr market · 48K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 68/100 · $99K/yr market · 48K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Scum Balls for Hot Tub — $99K/yr Amazon US Niche (2026) - Flapen"
---
# **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.
Market size 25Growth 83Conversion 97Competition 49Returns 98Price range 58Avg price 65Brand share 76Review moat 68Quality gap 84
**Returns**
**Incredible****0.4%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****15.0%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Great****4.2★**
avg incumbent rating — lower means beatable quality
**Growth**
**Great****+79.9%**
90-day search growth — must beat 0% to launch
**Brand share**
**Great****59%**
top-5 brand share — no brand owns this niche
**Review moat**
**Good****794.17**
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**
**Okay****56%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Bad****$99K**
$99K/yr · 48K searches
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
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 ~~](https://flapen.com/research/methodology)
## **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**
**43**
**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.
2K1KSpike '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jun, Jul, Aug · busiest ÷ quietest = 2.7×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/scum-balls-for-hot-tub/trend)
## **Top scum balls for hot tub search terms**
- **scum balls for spas hot tub**24K/yr+42.9%16.1% conv. - **scum balls for pool**8K/yr+808.9%11.3% conv. - **pool scum balls**3K/yr+534.8%11.8% conv. - **hot tub scum balls**5K/yr+27.2%16.5% conv. - **scum balls**4K/yr+86.7%16.2% conv. - **scumball for hot tub**4K/yr-51.7%14.2% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/scum-balls-for-hot-tub/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.
0%5%$5K10%$10K15%$15K20%$20K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**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**$10.39**4.2★158 rev](https://www.amazon.com/dp/B0FPLL8GLG) [2**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**$23.26**4.5★1,224 rev](https://www.amazon.com/dp/B01LQK9C92) [3**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**$9.47**4.4★214 rev](https://www.amazon.com/dp/B0DQZR47SC) [4**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**$17.67**4.3★237 rev](https://www.amazon.com/dp/B0BV6PGYCM) [5**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**$18.66**4.1★114 rev](https://www.amazon.com/dp/B0FWK63X1S)
**~~View all top sellers →~~**
### **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**$8.04**3 rev5mo ago](https://www.amazon.com/dp/B0GKV8X534) [**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**$20.51**91 rev6mo ago](https://www.amazon.com/dp/B0GD7QFJ2K) [**Matwsec 4 Pack Scum Balls for Spas Hot Tub 3 Inch Pool Sponge Oil Absorber**Matwsec**$8.17**16 rev7mo ago](https://www.amazon.com/dp/B0G7ZDL2H4) [**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**$12.99**158 rev8mo ago](https://www.amazon.com/dp/B0G34DRJMF) [**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**$9.01**8 rev9mo ago](https://www.amazon.com/dp/B0FXWN2MRX)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**MARKETTY Hot Tub Scum Absorber Balls Reusable Oil Absorbing Scum Sponge Washable Scum Absorbing Sponge Balls for Spa 4 Pack Easy to Clean Suitable for Hot Tub Pool Bath Keep Water Clean**MARKETTY**$13.53**4.1★**▲ 141%**](https://www.amazon.com/dp/B08L1Z3JQB) [**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**$20.51**4.2★**▲ 104%**](https://www.amazon.com/dp/B0GD7QFJ2K) [**Matwsec 4 Pack Scum Balls for Spas Hot Tub 3 Inch Pool Sponge Oil Absorber**Matwsec**$8.17**3.7★**▲ 103%**](https://www.amazon.com/dp/B0G7ZDL2H4) [**ASIJUNTYECHO Scum Balls for Spas Hot Tub Pool Sponge Oil Absorber Ball Reusable Washable Scum Remover Swimming Pool Accessories 4 Pack**ASIJUNTYECHO**$8.04**2.5★**▲ 85%**](https://www.amazon.com/dp/B0GKV8X534) [**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**$12.99**4.2★**▲ 77%**](https://www.amazon.com/dp/B0G34DRJMF)
**~~View all trending →~~**
## **What buyers say about scum balls for hot tub**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Ease Of Cleaning**18%
*“Easy clean”*
**Value For Money**18%
*“Good value”*
**Quality-Overall**13%
*“Decent item”*
**Advertised Vs Actual Product**10%
*“As advertised”*
**Ease Of Use**8%
*“Easy to use”*
**Absorbency**5%
*“They absorb so well”*
**Water Resistance**3%
*“Water is clear”*
**Size-Overall**3%
*“Good size”*
**Heating**3%
*“Great for our hot tub”*
**Design-Overall**3%
*“Especially their many designs”*
### **What buyers complain about **
**Functionality-Overall**19%
*“Not effective”*
**Durability**15%
*“Break down and fall apart”*
**Color**10%
*“assume that's why the color leached out”*
**Quality-Overall**7%
*“Trash”*
**Value For Money**6%
*“Not worth. the very cheap”*
**Adhesion/Stickiness**6%
*“they dont stick”*
**Shape/Style**5%
*“Not even spherical”*
**Size-Overall**4%
*“NOT FIT FOR PURPOSE”*
**Advertised Vs Actual Product**3%
*“The images for this product are deceptive”*
**Water Resistance**3%
*“These should float on the water”*
### **Top return reasons **
**Size-Overall**17%
**Functionality-Overall**17%
**Absorbency**10%
**Defective Material/Parts**8%
**Advertised Vs Actual Product**7%
**Shape/Style**6%
**Filtration**5%
**Adhesion/Stickiness**5%
**Quality-Overall**5%
**Value For Money**4%
## **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.
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